soc: fsl: qe: qe_io.c: access device tree property using be32_to_cpu

We need to apply be32_to_cpu to make this work correctly on
little-endian hosts.

Reviewed-by: Timur Tabi <timur@kernel.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Li Yang <leoyang.li@nxp.com>