fix(xilinx): resolve misra rule 8.4 violations

Fixed below MISRA violation:
- MISRA Violation: MISRA-C:2012 R.8.4:
  - A compatible declaration shall be visible when an object or function
    with external linkage is defined.
- Fix:
  - Declared variable as static.

Change-Id: I44a022de3d5a62d255e2481dc1f4d1e8df2c7eb0
Signed-off-by: Devanshi Chauhan Alpeshbhai <devanshi.chauhanalpeshbhai@amd.com>
2 files changed