drm/exynos/decon5433: & vs | typo

"&" was obviously intended instead of "|".  The original condition is
always true.

Fixes: b93c2e8b ("drm/exynos/decon5433: configure sysreg in case of hardware trigger")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>