SystemUI: Re-adjust signal strength icons

Change-Id: Id6dad0800e5e15ec694b24ecb9a88ccc0d4771d8
Add a HAF access permission

This is signature protected, and extremely dangerous since it
grants system GID.

Change-Id: I2528813de9341187f18ef708e7251b4e5e4003a3

Conflicts:
	core/res/AndroidManifest.xml
	core/res/res/values/cm_strings.xml
platform.xml: Fix syntax error

Change-Id: I1c2a5b2cce8deaccf0c5e120cf923723a8f9acfd
SystemUI: Use material delete icon

Change-Id: I11df5713486672e4f5c4784e6f94a893cf36b4dd