MLK-20935-4 doc: imx: ahab: Fix typo in mx8_mx8x_secure_boot.txt guide

Fix a typo in path provided for imx-mkimage iMX8QM and iMX8QXP directories.

Reported-by: Marius Grigoras <marius.grigoras@nxp.com>
Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit c75243c1a87a10f003377d9c144bcf412ba80440)
1 file changed