NOUPSTREAM: ANDROID: cpufreq: CPUFreq related vendor hooks

QC value-add requires the ability to override the value displayed
by show_cpuinfo_max_freq.

[CPNOTE: 03/06/21] Lee: Vendor related code - maintain forever

Squash:
  ANDROID: cpufreq: Add a restricted vendor hook for freq transition

Bug: 173984660
Bug: 181889516
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: Ida11256f399f0730bc1228524b9687df3e7b8bf4
Signed-off-by: Lee Jones <joneslee@google.com>