releasetools.py: Add support for full radio option
releasetools.py: Add support for full radio option

Occasionally we need to include full radio image in incremental OTAs.
Adding --full_radio option to support that.

Bug: 19994922
Change-Id: I3a3e227bab59c8b8283748cac1342bb62c86acac

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead