MLK-20238-01 plat: imx: fix uninitialized value using

fix Coverity: CID 5243766: Uninitialized scalar variable (UNINIT)
issue.

Signed-off-by: Bai Ping <ping.bai@nxp.com>
(cherry picked from commit 9fe5f166ab303f125975482a0ed0b7d96cbccd67)
1 file changed