sh: sh7760fb: Add support SH7720/SH7721 of Renesas

SH7720 and 7721 has IP of Frame Buffer same as SH7760.
This driver can support these.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

drivers/video/Kconfig

@@ -2021,13 +2021,15 @@ config FB_COBALT
 	depends on FB && MIPS_COBALT
 
 config FB_SH7760
-       bool "SH7760/SH7763 LCDC support"
-       depends on FB && (CPU_SUBTYPE_SH7760 || CPU_SUBTYPE_SH7763)
+	bool "SH7760/SH7763/SH7720/SH7721 LCDC support"
+	depends on FB && (CPU_SUBTYPE_SH7760 || CPU_SUBTYPE_SH7763 \
+		|| CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721)
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
-       help
-         Support for the SH7760/SH7763 integrated (D)STN/TFT LCD Controller.
+	---help---
+	  Support for the SH7760/SH7763/SH7720/SH7721 integrated
+	  (D)STN/TFT LCD Controller.
 	  Supports display resolutions up to 1024x1024 pixel, grayscale and
 	  color operation, with depths ranging from 1 bpp to 8 bpp monochrome
 	  and 8, 15 or 16 bpp color; 90 degrees clockwise display rotation for