Adds bootcmd identificaton on basis on boot source, valid in TFABOOT configuration. Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com> Signed-off-by: Pankit Garg <pankit.garg@nxp.com> [YS: remove unnecessary braces] Reviewed-by: York Sun <york.sun@nxp.com>