Revert "Add back getFastPairScanEnabled and setFastPairScanEnabled System API"

This reverts commit 4af0e0f784a88d7af2d64ccbf07d8549b93d33e8.

Reason for revert: not support the feature anymore

Test: -m
Change-Id: I26c1f1dd5f36ecb6c1386ccf6ec84118fd93017d
4 files changed