fix(xilinx): use lib/smccc.h macros instead of trusty spd

There is no reason to use macros from trusty spd header and creating
dependency on it. Use directly macros from lib/smccc.h

Co-developed-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
Change-Id: I7cf1f76a5358ffc297c914f41c437469f5a42411
1 file changed