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ACPI updates for 4.21-rc1

 - Update the ACPICA code in the kernel to the 20181213 upstream
   revision including:
   * New Windows _OSI strings (Bob Moore, Jung-uk Kim).
   * Buffers-to-string conversions update (Bob Moore).
   * Removal of support for expressions in package elements (Bob
     Moore).
   * New option to display method/object evaluation in debug output
     (Bob Moore).
   * Compiler improvements (Bob Moore, Erik Schmauss).
   * Minor debugger fix (Erik Schmauss).
   * Disassembler improvement (Erik Schmauss).
   * Assorted cleanups (Bob Moore, Colin Ian King, Erik Schmauss).

 - Add support for a new OEM _OSI string to indicate special handling
   of secondary graphics adapters on some systems (Alex Hung).

 - Make it possible to build the ACPI subystem without PCI support
   (Sinan Kaya).

 - Make the SPCR table handling regard baud rate 0 in accordance with
   the specification of it and make the DSDT override code support
   DSDT code names generated by recent ACPICA (Andy Shevchenko, Wang
   Dongsheng, Nathan Chancellor).

 - Add clock frequency for Hisilicon Hip08 SPI controller to the ACPI
   driver for AMD SoCs (APD) (Jay Fang).

 - Fix the PM handling during device init in the ACPI driver for
   Intel SoCs (LPSS) (Hans de Goede).

 - Avoid double panic()s by clearing the APEI GHES block_status
   before panic() (Lenny Szubowicz).

 - Clean up a function invocation in the ACPI core and get rid of
   some code duplication by using the DEFINE_SHOW_ATTRIBUTE macro
   in the APEI support code (Alexey Dobriyan, Yangtao Li).