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ACPI updates for 5.2-rc1

 - Convert the ACPI documentation in the kernel source tree to the
   .rst format and split it into the admin guide, driver API and
   firmware guide parts (Changbin Du).

 - Add a PRP0001 usage example to the ACPI documentation (Thomas
   Preston).

 - Switch over the users of the acpi_dev_get_first_match_name()
   library function which turned out to be problematic to a new,
   better one called acpi_dev_get_first_match_dev() (Andy Shevchenko,
   YueHaibing).

 - Update the ACPICA code in the kernel to upstream release 20190405
   including:
   * Null pointer dereference check in acpi_ns_delete_node() (Erik
     Schmauss).
   * Multiple macro and function name changes (Bob Moore).
   * Predefined operation region name fix (Erik Schmauss).

 - Fix hibernation issue on systems using the Baytrail and
   Cherrytrail Intel SoCs introduced during the 4.20 development
   cycle (Hans de Goede).

 - Add Sony VPCEH3U1E to the backlight quirk list (Zhang Rui).

 - Fix button handling during system resume (Zhang Rui).

 - Add a device PM diagnostic message (Rafael Wysocki).

 - Clean up the code, comments and white space in multiple places
   (Bjorn Helgaas, Gustavo Silva, Kefeng Wang).