drm/komeda: Fix komeda driver build error

Fix the build errors lead by

'commit 4039f029 ("drm/komeda: Add option to print WARN- and INFO-level IRQ events")'

Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191113013114.3013-1-james.qian.wang@arm.com