Removing GHBM logic from codebase since it has been replaced by LHBM. This will simplify the current implementation, and assist with future refactors and the transition to Kotlin. Fixes: 227229729 Test: atest UdfpsViewTest Test: atest DisplayModeDirectorTest Change-Id: I0d1e7ffb610154f4d56afab8385883a0389f89db