Convert hidl_bitfield and bitfield to int

The previous API surface replaced bitfields of enums with the enum,
which only allows one value at a time. Instead of using the enum,
replace with int instead.

Test: build
Bug: 210712359
Change-Id: I2963200311494718ae89af8deade0b1dd41354f8
Merged-In: I2963200311494718ae89af8deade0b1dd41354f8
28 files changed