AppOpsManager: set default mode for sms write operation to MODE_ALLOWED.

The default mode for sms write operation is set to
MODE_IGNORED, so this was not allowing Bluetooth Map application
to do any write operation of SMS. So set the default mode to
MODE_ALLOWED.

Change-Id: Ia7cdb62a5c0015f9cd31409877728efc6f0a9ae5
(cherry picked from commit 050d904fefaa937aca14c49024e70ff1dab25fba)
(cherry picked from commit b3565d3daf1fc2d05cdc564ee40bdac03cb97e49)
(cherry picked from commit db67671b8e50346ce3d193a28c027d5d6e99f455)