Bluetooth: GAP: Read the clock offset on ACL connection complete

Keep the Clock offset valid for one Hour and read it again after
connection complete so that we have most recent value. This helps
for faster ACL connections.

CRs-fixed: 430132
Change-Id: I1526878a7365f9cc0c654e0af6c4dd214fac4cd8
Signed-off-by: Mallikarjuna GB <gbmalli@codeaurora.org>
Merge "Bluetooth: GAP: Read the clock offset on ACL connection complete"