Revert^2 "Disable -Wno-single-bit-bitfield-constant-conversion locally"

This reverts commit c667749398f76b05bb2e72115d9491118ed0d197.

Reason for revert: This change was reverted along with the soong flag switch even though it is safe to merge.

Change-Id: Ia4dbe7fc39361900e1f48636be9ffe65453c2c9d