fbdev: sh_mipi_dsi: add set_dot_clock() for each platform

Dot clock of SH MIPI are depends on each platform board.
This patch adds set_dot_clock() function for it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/include/video/sh_mipi_dsi.h b/include/video/sh_mipi_dsi.h
index c8225b4..310b883 100644
--- a/include/video/sh_mipi_dsi.h
+++ b/include/video/sh_mipi_dsi.h
@@ -48,6 +48,9 @@
 	unsigned long			flags;
 	u32				clksrc;
 	unsigned int			vsynw_offset;
+	int	(*set_dot_clock)(struct platform_device *pdev,
+				 void __iomem *base,
+				 int enable);
 };
 
 #endif