Handle RIL failures of DATA_ALLOWED.

Some of our radios don't handle the command so we need to watch
for errors and move to appropriate states.  This fixes a race
between SIM notifications and ServiceState where often on
VZW we'd end up thinking we were detached (and never setting
up data calls) when we actually were still attached.

bug:20537726
Change-Id: Ieb32e613c16a79e8c18d65d1cce84d093d51a4b0