fix(zynqmp): resolve misra R14.4 warnings

MISRA Violation: MISRA-C:2012 R.14.4
The controlling expression of an if statement and the controlling
expression of an iteration-statement shall have essentially Boolean type.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I8f3f6f956d1d58ca201fb5895f12bcaabf2afd3b