Revert "Remove support for COMBINED_SIGNAL_ICONS"

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: I101f16263fff7f5ac2076fffab41824be8200953