fix(detect-newly-added-files.sh):file diff with regard to integration

This patch compares and filters the newly added tf-a source files
between the integration branch and the change set under review instead
of the master. It will resolve in sending correct status to the tf-daily
job and will further allow the master and integration to sync up.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I94932aa50243bf5d0f4caa45ca546fed62730ce8
1 file changed