HidlUtils: remove temporary conversion functions

Remove temporary conversion functions and update
the code that was using them.

Bug: 142480271
Test: m
Change-Id: Idf36dbac398efbc03bd6da68c79f6fb1ddc24e9c
Merged-In: Idf36dbac398efbc03bd6da68c79f6fb1ddc24e9c
1 file changed