RM6785: Drop MediaTek PowerHAL

* We still have to keep some vendor interfaces and libs
  since some HALs have dependencies on them.

* Also switch to stub AIDL power service until we can get
  libperfmgr properly implemented.

Signed-off-by: bengris32 <bengris32@protonmail.ch>
Change-Id: I3e2fa26fd64b6e3011846e46e766e66eab68c392
11 files changed