fix(zynqmp): resolve the misra 8.6 warnings

MISRA Violation: MISRA-C:2012 R.8.6
- Function is declared but never defined.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I0df53ef4b2c91fa8ec3bf3e5491bf37dd7400685