Merge branches 'acpi-processor' and 'acpi-cppc'

Merge ACPI processor driver updates and ACPI CPPC library updates for
7.1-rc1:

 - Address multiple assorted issues and clean up the code in the ACPI
   processor idle driver (Huisong Li)

 - Replace strlcat() in the ACPI processor idle drive with a better
   alternative (Andy Shevchenko)

 - Rearrange and clean up acpi_processor_errata_piix4() (Rafael Wysocki)

 - Move reference performance to capabilities and fix an uninitialized
   variable in the ACPI CPPC library (Pengjie Zhang)

 - Add support for the Performance Limited Register to the ACPI CPPC
   library (Sumit Gupta)

 - Add cppc_get_perf() API to read performance controls, extend
   cppc_set_epp_perf() for FFH/SystemMemory, and make the ACPI CPPC
   library warn on missing mandatory DESIRED_PERF register (Sumit Gupta)

 - Modify the cpufreq CPPC driver to update MIN_PERF/MAX_PERF in target
   callbacks to allow it to control performance bounds via standard
   scaling_min_freq and scaling_max_freq sysfs attributes and add sysfs
   documentation for the Performance Limited Register to it (Sumit Gupta)

* acpi-processor:
  ACPI: processor: idle: Reset cpuidle on C-state list changes
  cpuidle: Extract and export no-lock variants of cpuidle_unregister_device()
  ACPI: processor: idle: Fix NULL pointer dereference in hotplug path
  ACPI: processor: idle: Reset power_setup_done flag on initialization failure
  ACPI: processor: Rearrange and clean up acpi_processor_errata_piix4()
  ACPI: processor: idle: Replace strlcat() with better alternative
  ACPI: processor: idle: Remove redundant static variable and rename cstate check function
  ACPI: processor: idle: Move max_cstate update out of the loop
  ACPI: processor: idle: Remove redundant cstate check in acpi_processor_power_init
  ACPI: processor: idle: Add missing bounds check in flatten_lpi_states()

* acpi-cppc:
  ACPI: CPPC: Check cpc_read() return values consistently
  ACPI: CPPC: Fix uninitialized ref variable in cppc_get_perf_caps()
  ACPI: CPPC: Move reference performance to capabilities
  cpufreq: CPPC: Add sysfs documentation for perf_limited
  ACPI: CPPC: add APIs and sysfs interface for perf_limited
  cpufreq: cppc: Update MIN_PERF/MAX_PERF in target callbacks
  cpufreq: CPPC: Update cached perf_ctrls on sysfs write
  ACPI: CPPC: Extend cppc_set_epp_perf() for FFH/SystemMemory
  ACPI: CPPC: Warn on missing mandatory DESIRED_PERF register
  ACPI: CPPC: Add cppc_get_perf() API to read performance controls