Revert "fb: Incoming Call in Background (3/3)" -->  Non-intrusive is better

This reverts commit 01693c637b13dfecd7a7e2aa2103f7b0b8062ccf.

Change-Id: Ie9cb5433b048098f9f27719c3fffca739991ebf5
Signed-off-by: DHOMD <DHO@dho.im>