Bluetooth-Wipower: MTP continues advertising WPT UUID post connection.

a> Stack conitnues to advertise post connection which would lead to cross
connection with other PTU within vicinity, So as to avoid rest of PTU's
scanning the DUT which continues to advertise, Advertiements are being
stopped post connection.
b> .setTimeout() with any value less than 180Sec as parameter ensures
that it sets the limited mode advertising. since wipower spec demands
the advertisement mode to be limited this partciular change is been
made and the timeout value is been set to 30Secs which is far enough
for PTU to initiate connection.

Change-Id: Id63bcc19d714d087fcb6c78553572b649f106580
CRs-fixed: 734301