video: fbdev: wmt_ge_rops: Fix function not declared warnings

Include own header to fix "function not declared" warnings.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Tony Prisk <linux@prisktech.co.nz>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://patchwork.freedesktop.org/patch/msgid/20201206190247.1861316-9-sam@ravnborg.org

drivers/video/fbdev/wmt_ge_rops.c

@@ -11,6 +11,7 @@
 #include <linux/fb.h>
 #include <linux/platform_device.h>
 #include "core/fb_draw.h"
+#include "wmt_ge_rops.h"
 
 #define GE_COMMAND_OFF		0x00
 #define GE_DEPTH_OFF		0x04