da8xx-fb: add missing FB_BLANK operations

From: Yegor Yefremov <redacted>

add FB_BLANK_NORMAL, FB_BLANK_VSYNC_SUSPEND and FB_BLANK_HSYNC_SUSPEND
modes (copy drivers/video/omap2/omapfb/omapfb-main.c implementation).
Otherwise X-server will complain about invalid parameter.

Signed-off-by: Yegor Yefremov <redacted>
---
 drivers/video/da8xx-fb.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 29577bf..9879edc 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c

@@ -987,6 +987,9 @@ static int cfb_blank(int blank, struct fb_info *info)
 
 		lcd_enable_raster();
 		break;
+	case FB_BLANK_NORMAL:
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
 	case FB_BLANK_POWERDOWN:
 		if (par->panel_power_ctrl)
 			par->panel_power_ctrl(0);