Revert "Disable BitStructs::NestedFieldAssignment."

This reverts commit 8404f348c96c929981b157b8240d55bc81222003.

Reason for revert: b/148125232 was fixed
Bug: 148125232

Change-Id: I5a8232959f804c203850aaaf3dac97e286dd188f
1 file changed