exynos: video: change mipi dsi write function parameters correctly

This patch have changed mipi dsi write functions' parameters correctly
so that type cast operations were removed. And mipi dsi payload is
composed with array of panel commands to improve readability.

Signed-off-by: Donghwa Lee <dh09.lee@samsung.com>
diff --git a/drivers/video/exynos_mipi_dsi_lowlevel.c b/drivers/video/exynos_mipi_dsi_lowlevel.c
index b47eee4..1313bce 100644
--- a/drivers/video/exynos_mipi_dsi_lowlevel.c
+++ b/drivers/video/exynos_mipi_dsi_lowlevel.c
@@ -600,7 +600,7 @@
 }
 
 void exynos_mipi_dsi_wr_tx_header(struct mipi_dsim_device *dsim,
-	unsigned int di, unsigned int data0, unsigned int data1)
+	unsigned int di, const unsigned char data0, const unsigned char data1)
 {
 	struct exynos_mipi_dsim *mipi_dsim =
 		(struct exynos_mipi_dsim *)samsung_get_base_mipi_dsim();