Remove unneeded new RIL command.

Remove the recently added RIL_REQUEST_SET_RADIO_MODE command and update
the definition of the RIL_REQUEST_NV_RESET_CONFIG parameter.
Also, space out the NV item enum values so we can add new items per category.

Bug: 12864208
Change-Id: I1201c92198a8cd7e169efe7055b58259d975309b