soc: fsl: qe: fix sparse warnings for ucc.c

Fixes the following sparse warnings:

drivers/soc/fsl/qe/ucc.c:637:20: warning: incorrect type in assignment (different address spaces)
drivers/soc/fsl/qe/ucc.c:637:20:    expected struct qe_mux *qe_mux_reg
drivers/soc/fsl/qe/ucc.c:637:20:    got struct qe_mux [noderef] <asn:2> *
drivers/soc/fsl/qe/ucc.c:652:9: warning: incorrect type in argument 1 (different address spaces)
drivers/soc/fsl/qe/ucc.c:652:9:    expected void const volatile [noderef] <asn:2> *addr
drivers/soc/fsl/qe/ucc.c:652:9:    got restricted __be32 *
drivers/soc/fsl/qe/ucc.c:652:9: warning: incorrect type in argument 2 (different address spaces)
drivers/soc/fsl/qe/ucc.c:652:9:    expected void volatile [noderef] <asn:2> *addr
drivers/soc/fsl/qe/ucc.c:652:9:    got restricted __be32 *

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