ASACORE-1027 Fix crash in UpdateSerialNumber

Call LocalEndpoint::UpdateSerialNumber using origSender.
DaemonRouter::localEndpoint may be invalid due to being overwritten by DaemonRouter::UnregisterEndpoint.

Change-Id: I559d94616ad5b166586ecc61d9968416ccc666c3
Signed-off-by: Sheshambika Venkateshwaran <sheshamb@qce.qualcomm.com>
Merge "ASACORE-1027 Fix crash in UpdateSerialNumber" into RB14.12