Revert "InCallUI: Incoming Call in Background (1/3)"

This reverts commit c6e504b92532e8f63d614eef2f70396b9919c169.
Revert "Remove non intrusive incall ui (3/3)"

This reverts commit 32b74af2f921dacbd36d2675d7064f6d9f49d770.
Keep InCallUI in memory (1/3)

In lower end devices, startup of the InCallUI process can take
up to 10 seconds when the device is busy, which prevents the user
from taking the call. Keep the process in memory like previous
versions where they are a part of Phone.apk.

This converts InCallUI into a dummy apk with the persistent
attribute set to true and allows the activity from Dialer.apk,
which uses the com.android.incallui process to be loaded into the
persistent process.

Change-Id: Idfb7fa760eacc8d6e46d50ce682fb06c0acfc8f4

Conflicts:
	AndroidManifest.xml