board: fsl: lx2160a: Fix the typo in board_fix_fdt

Fix a typo that caused incorrect reg-name for pcie node in lx2160a rev2.

Fixes: 5d535aa4 ("board: fsl: lx2160a: implement board_fix_fdt")

Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>