fix(plat/xilinx/versal): resolve misra R10.6

MISRA Violation: MISRA-C:2012 R.10.6
- The value of a composite expression shall not be assigned to an object
  with wider essential type

Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
Change-Id: Ia0d13c3cfeb13d22b6fc7e8869cc713218302973
1 file changed