drm/mgag200:remove rebundant word "or" in comments

there is a repeated word "or" in comments, so remove it.
Signed-off-by: shaomin Deng <dengshaomin@cdjrlc.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220718145536.4866-1-dengshaomin@cdjrlc.com

drivers/gpu/drm/mgag200/mgag200_reg.h

@@ -96,7 +96,7 @@
 #define MGAREG_SRCORG		0x2cb4
 #define MGAREG_DSTORG		0x2cb8
 
-/* add or or this to one of the previous "power registers" to start
+/* add or this to one of the previous "power registers" to start
    the drawing engine */
 
 #define MGAREG_EXEC		0x0100