Bluetooth: Add SDK apis for Wipower and Peripheral feature

changes needed for Wipower and Periferal features.

CRs-fixed: 587811

Change-Id: Ibe73124daf78c79498fd1a6cbbcd75a88006c688
Bluetooth: Handle exceptions for bluetoot socket read

Handled IO exception in read function of BluetootSocket,
and also introduced a null check for mSocketIS.

CRs-Fixed: 605606
Change-Id: Ic948c72269e0de486a8f49163830528b002198ff
OBEX: Reduce Obex MTU size for A2DP or SCO concurrency

Reduce Obex MTU to 8k from 64k when OPP send is tried with
SCO / A2DP streaming in progress, so that the continue
response for first complete Obex PUT packet is received
from SOC within 50 seconds time frame.

CRs-Fixed: 571865
Change-Id: I1eae114f57f2a92ee4b26c82d8f55fafe02775b8