RM6785: Switch to OSS Power AIDL

* Make libpowerhal.so a module so we can link against it.
* Also drop the prebuilt implementation and vintf fragment.

Signed-off-by: bengris32 <bengris32@protonmail.ch>
Change-Id: I9cec6a355cc506d80338b0f9d6978bbca311b0a2
2 files changed