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sound updates for 5.1

We had again a busy development cycle with many new drivers as well as
lots of core improvements / cleanups.  Let's go for highlights:

ALSA core:
- PCM locking scheme was refactored for reducing a global rwlock
- PCM suspend is handled in the device type PM ops now; lots of
  explicit calls were reduced by this action
- Cleanups about PCM buffer preallocation calls
- Kill NULL device object in memory allocations
- Lots of procfs API cleanups

ASoC core:
- Support for only powering up channels that are actively being used
- Cleanups / fixes of topology API

ASoC drivers:
- MediaTek BTCVSD for a Bluetooth radio chip, which is the first such
  driver we've had upstream!
- Quite a few improvements to simplify the generic card drivers,
  especially the merge of the SCU cards into the main generic drivers
- Lots of fixes for probing on Intel systems to follow more standard
  styles
- A big refresh and cleanup of the Samsung drivers
- New drivers: Asahi Kasei Microdevices AK4497, Cirrus Logic CS4341
  and CS35L26, Google ChromeOS embedded controllers, Ingenic JZ4725B,
  MediaTek BTCVSD, MT8183 and MT6358, NXP MICFIL, Rockchip RK3328,
  Spreadtrum DMA controllers, Qualcomm WCD9335, Xilinx S/PDIF and PCM
  formatters

ALSA drivers:
- Improvements of Tegra HD-audio controller driver for supporting new
  chips
- HD-audio codec quirks for ALC294 S4 resume, ASUS laptop, Chrome
  headset button support and Dell workstations
- Improved DSD support on USB-audio
- Quirk for MOTU MicroBook II USB-audio
- Support for Fireface UCX support and Solid State Logic Duende
  Classic/Mini

ASoC: More changes for v5.1

Another batch of changes for ASoC, no big core changes - it's mainly
small fixes and improvements for individual drivers.

 - A big refresh and cleanup of the Samsung drivers, fixing a number of
   issues which allow the driver to be used with a wider range of
   userspaces.
 - Fixes for the Intel drivers to make them more standard so less likely
   to get bitten by core issues.
 - New driver for Cirrus Logic CS35L26.

This is the 4.20.13 stable release

This is the 4.19.26 stable release

This is the 4.14.104 stable release

This is the 4.9.161 stable release

mei-hdcp driver

mei driver for the me hdcp client, for use by drm/i915.

Including the following prep work:
- whitelist hdcp client in mei bus
- merge to include char-misc-next
- drm/i915 side of the mei_hdcp/i915 component interface
- component prep work (including one patch touching i915&snd-hda)

Linux 5.0-rc8

This is the 4.20.12 stable release

This is the 4.19.25 stable release

This is the 4.14.103 stable release

This is the 4.9.160 stable release

This is the 4.4.176 stable release

This is the 3.18.136 stable release

This time we have, of note:
 * the massive patch series for multi-BSSID support, I ended up
   applying that through a side branch to record some details
 * CSA improvements
 * HE (802.11ax) updates to Draft 3.3
 * strongly typed element iteration/etc. to make such code more
   readable - this came up in particular in multi-BSSID
 * rhashtable conversion patches from Herbert
Along, as usual, with various fixes and improvements.

Three more fixes:
 * mac80211 mesh code wasn't allocating SKB tailroom properly
   in some cases
 * tx_sk_pacing_shift should be 7 for better performance
 * mac80211_hwsim wasn't propagating genlmsg_reply() errors

This is the 4.20.11 stable release

This is the 4.19.24 stable release

This is the 4.14.102 stable release

This is the 4.9.159 stable release