MAINTAINERS: Add Marijn Suijten as drm/msm reviewer

As I get more and more active in the drm/msm space, yet sometimes miss
out on patches (where I was involved in previous discussions), add
myself as reviewer to make this involvement clear.
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Rob Clark <robdclark@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/531770/
Link: https://lore.kernel.org/r/20230411224308.440550-1-marijn.suijten@somainline.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

MAINTAINERS

@@ -6514,6 +6514,7 @@ M:	Rob Clark <robdclark@gmail.com>
 M:	Abhinav Kumar <quic_abhinavk@quicinc.com>
 M:	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
 R:	Sean Paul <sean@poorly.run>
+R:	Marijn Suijten <marijn.suijten@somainline.org>
 L:	linux-arm-msm@vger.kernel.org
 L:	dri-devel@lists.freedesktop.org
 L:	freedreno@lists.freedesktop.org