Modify the API for camera privacy allowlist

After AAOS IVI review, it was recommended to not categorize
the camera privacy allowlisted apps into helpful apps,required apps
and helpful and required apps. Therefore removing those categories and changing the name to be more descriptive.

Bug: 326182516
Test: Build and test using camera privacy settings UI on automotive devices.
Change-Id: Ifa72945b1a7f7985ae4cf4bced0a0bb9f570d178