Revert "Make incoming call screen style configurable (1/3)"

This reverts commit efa82430d4e15fb3e8c9cba2af89a9e2872156e8.
Make incoming call screen style configurable (1/3)

Change-Id: I12e108e11afcc87cd0ed717dbc6f8a2a2c0f1743

Conflicts:
	core/java/android/provider/Settings.java

(cherry picked from commit 1e2fc058bd300580e29824b3a4f2474861d2e116)