Bug 868896: Added RIL_REQUEST_GET_UNLOCK_RETRY_COUNT

With the new RIL request rild sends AT+CPINR to the SIM card, and
returns the number of default and remaining tries for unlocking a
specific lock.

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Merge pull request #20 from tdz/bug-868896

Bug 868896: Added RIL_REQUEST_GET_UNLOCK_RETRY_COUNT. r=vicamo