drm: mxsfb: Remove unused macros from mxsfb_regs.h

mxsfb_regs.h defines macros related to register bits. Some of them are
not used and don't clearly map to any particular register, so their
purpose isn't known. Remove them.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200727020654.8231-5-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/mxsfb/mxsfb_regs.h

@@ -91,17 +91,9 @@
 #define MXSFB_MAX_XRES			0xffff
 #define MXSFB_MAX_YRES			0xffff
 
-#define RED 0
-#define GREEN 1
-#define BLUE 2
-#define TRANSP 3
-
 #define STMLCDIF_8BIT  1 /* pixel data bus to the display is of 8 bit width */
 #define STMLCDIF_16BIT 0 /* pixel data bus to the display is of 16 bit width */
 #define STMLCDIF_18BIT 2 /* pixel data bus to the display is of 18 bit width */
 #define STMLCDIF_24BIT 3 /* pixel data bus to the display is of 24 bit width */
 
-#define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT	(1 << 6)
-#define MXSFB_SYNC_DOTCLK_FALLING_ACT	(1 << 7) /* negative edge sampling */
-
 #endif /* __MXSFB_REGS_H__ */