Delete obsolete activity alias for dev settings

This activity alias is here since android 4.x for backward
compatibility. We no longer need it, and keeping it will cause security
issue.

Change-Id: Ib7817fd7cf8c8e66ca50534a0387cdc5773f837b
Merged-In: I3f985e7fe14bd290db73b8c46dd817591df02015
Fixes: 92497653
Test: manual
(cherry picked from commit 0e1393ae)