base

Obex : Reduce MTU Size.

Use case:
1. Start Low Latency and High Tx Power adv from the DUT
2. From a 2nd DUT scan, connect and pair with the LEP DUT
3. Connect the DUT to a SCO HS
4. Connect the DUT to 2 BR/EDR HID devices
5. Start MO call from the DUT going over SCO
6. Start sending a file from Phone over OPP to the DUT

Result:
After a while the OPP link disconnects
reason: "Connection Timeout"

Fix:
Reduce Obex MTU to 8k if reduce MTU is enable

CRs-Fixed: 879015
Change-Id: I21cb27ff98e07cd923d6e28a67b3b52835b68956