bluetooth: Configure DUT as MASTER for outgoing connection requests

Request MASTER ONLY role while establishing connection with remote
devices. Post ACL establishment, update link policy by disabling
role switch. This would prevent remote devices from requesting
for role switch post ACL creation and will allow the DUT to be
in MASTER role always. This is done to satisy BTC requirements
for achieving better WLAN throughput and performance.

Change-Id: If3187d0e8359d70ffb12e63e397b621a7c1a6031
Signed-off-by: Anantha Krishnan <ananthk@codeaurora.org>