[cc13x2x7_26x2x7] BLE Service UUID incorrect

[andersbangGF]

Problem

When trying to connect TI Matter devices using Darwin CHIPTool it fails to connect with the error ""Service not found on the device."
This is because the TI Platform implementation exposes a full 128Bit service UUID instead of the 16Bit one used in matter. The 16Bit UUID is correctly included in the scanresp package and therefore most implementations of the controller will connect without problems.

Proposed Solution

Change the service UUID to 16Bit (0xFFF6) in the TI platform implementation of BLE.