telephony: Support for Virgin Mobile MMS

Change-Id: Ibc38789f410ebec9a411294e6bb4ab21cd040f27
Fix for phones that do not support RIL_REQUEST_DATA_REGISTRATION_STATE

Some older phones do not support reporting data registration status
via RIL_REQUEST_DATA_REGISTRATION_STATE. Instead, this fix allows them
to report via RIL_REQUEST_VOICE_REGISTRATION_STATE.

PS2: added missing brackets
PS3: added back !mIsSubscriptionFromRuim to if statement
PS4: changed to proper naming scheme and removed duplicate method

Change-Id: Ifc546256d2af26f4d9e372d66d6a4a557033af69
Revert "SamsungCDMAv6RIL: update signal strength values for JB modem"

This reverts commit a6ad2991b00bf7fe90b4f446129e118279eaab9d.

Change-Id: I6ad7f97c76d5ee0d580fb93f1a055316af43f57b