tbs2910: migrate to DM_VIDEO

Migration to DM_VIDEO driver is long overdue, configure it in
board config files. To enable the display set stdout like:

  setenv stdout serial,vidconsole

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Tested-by: Soeren Moch <smoch@web.de>
diff --git a/configs/tbs2910_defconfig b/configs/tbs2910_defconfig
index fbd2293..27080c7 100644
--- a/configs/tbs2910_defconfig
+++ b/configs/tbs2910_defconfig
@@ -91,8 +91,15 @@
 CONFIG_CI_UDC=y
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_I2C_EDID=y
+CONFIG_DM_VIDEO=y
+# CONFIG_BACKLIGHT is not set
+# CONFIG_CMD_VIDCONSOLE is not set
+# CONFIG_VIDEO_BPP8 is not set
+# CONFIG_VIDEO_BPP32 is not set
+# CONFIG_VIDEO_ANSI is not set
+# CONFIG_PANEL is not set
 CONFIG_VIDEO_IPUV3=y
-CONFIG_VIDEO=y
+CONFIG_SYS_WHITE_ON_BLACK=y
 # CONFIG_GZIP is not set
 CONFIG_OF_LIBFDT_ASSUME_MASK=0xff
 # CONFIG_EFI_LOADER is not set