fix(plat/zynqmp): fix coverity scan warnings

- Fix uninitialized variable use
- Fix array overrun issue

Signed-off-by: Tanmay Shah <tanmay.shah@xilinx.com>
Signed-off-by: Ronak Jain <ronak.jain@xilinx.com>
Change-Id: I604416531122c9208793d66c26b1fa69c95f3165
2 files changed