drm/sti: Add __iomem for mixer_dbg_mxn's parameter

Sparse complains about incorrect type in argument 1.
expected void const volatile  __iomem *ptr but got void *.
so modify mixer_dbg_mxn's addr parameter.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: a5f8107 ("drm/sti: add debugfs entries for MIXER crtc")
Signed-off-by: Pei Xiao <[email protected]>
Acked-by: Raphael Gallais-Pou <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/c28f0dcb6a4526721d83ba1f659bba30564d3d54.1732087094.git.xiaopei01@kylinos.cn
Signed-off-by: Raphael Gallais-Pou <[email protected]>

Author: Pei Xiao

drivers/gpu/drm/sti/sti_mixer.c

@@ -137,7 +137,7 @@ static void mixer_dbg_crb(struct seq_file *s, int val)
 	}
 }
 
-static void mixer_dbg_mxn(struct seq_file *s, void *addr)
+static void mixer_dbg_mxn(struct seq_file *s, void __iomem *addr)
 {
 	int i;