Revert "Add an @Inject-able MobileSignalControllerFactory"

Revert submission 19279477

Reason for revert: b/240223150
Reverted Changes:
I1bef3f309:Remove support for COMBINED_SIGNAL_ICONS
I38f76a746:Create a MobileStatusTrackerFactory
I0b1dd8e71:Change from deprecated telephony api
Id1a02134f:[Cleanup] Order NetworkController's intent filters...
I405ad3858:Add an @Inject-able MobileSignalControllerFactory

Change-Id: Ic004e4164580d19914912e6fb8d8951cd075f9e9