Support GSM AT commands for SMS over bluetooth (1/2)

Modifications required to support the older GSM "AT+" commands for SMS over
the bluetooth transport for use with car radios, etc. This must piggy back
on the existing handsfree code as the spec uses that channel for the commands.
(2 parts: frameworks/base and packages/apps/Phone)

frameworks/base:
Additions to JNI and supporting framework code to allow sending of individual
characters and to receive the PDU stream - neither of which are CR terminated.

IccSmsInterfaceManager.java requires a reversion in sendText() to use
enforceCallingOrSelfPermission() instead of enforceCallingPermission().  This
is apparently the only way Phone.apk can actually send an SMS.  (ICS used the
OrSelf variation while JB changed to use the stricter version.)

Change-Id: Icff0d2c55170e9c47302b21ce3f15ce863c8c756
Signed-off-by: Gary Dezern <garyd9@gmail.com>