Merge branches 'acpi-apei', 'acpi-bus', 'acpi-cppc' and 'acpi-video'

Merge assorted ACPI support fixes for 7.1-rc2:

 - Fix EINJV2 memory error injection in APEI (Tony Luck)

 - Add missing notifier_block structure forward declaration to
   acpi_bus.h (Bartosz Golaszewski)

 - Fix related_cpus inconsistency during CPU hotplug in the ACPI CPPC
   library (Jinjie Ruan)

 - Add a quirk to force native backlight on HP OMEN 16 (8A44) in the
   ACPI video bus driver (Shivam Kalra)

* acpi-apei:
  ACPI: APEI: EINJ: Fix EINJV2 memory error injection
  ACPICA: Provide #defines for EINJV2 error types

* acpi-bus:
  ACPI: bus: add missing forward declaration to acpi_bus.h

* acpi-cppc:
  ACPI: CPPC: Fix related_cpus inconsistency during CPU hotplug

* acpi-video:
  ACPI: video: force native backlight on HP OMEN 16 (8A44)