Implement Long Write Operations for Tizen TV

Implement Long Write Operations for Tizen TV

In Tizen Platform, For long write operations, bluez handles
all the ATT_Prepare_Write_Req packets and sends the complete
data to the BT-Service when ATT_EXEC_WRITE_REQ is received.

Where as in Tizen TV, Bluedroid works in a different manner.
It sends every ATT_Prepare_Write_Req packet to bt-service using
OAL_EVENT_GATTS_REQUEST_WRITE event with flag is_prep=1 and thus,
allows upper layers to handle long write operation on its own.

This change will perform all the below operations(in case of bluedroid)
at bt-service level which bluez performs for GATT long write:
1. Appending all the Prepare_Write_Req data in a list and send
   prepare_write_resp.
2. Passing the complete data to the capi when
   OAL_EVENT_GATTS_EXEC_REQUEST_WRITE event comes.

Thus this change will help in maintaining uniformity at CAPI level
irrespective of Bluez or Bluedroid.

Change-Id: Iae005dc3643d54783dbd3ddd8c1dc70a1684be99
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>