at91sam9n12ek: disable obsolete VIDEO config

DM_VIDEO conversion deadline has passed, disable VIDEO config.
Boards should convert to DM_VIDEO if they need video console
support.
Signed-off-by: NAnatolij Gustschin <agust@denx.de>
Cc: Eugen Hristev <eugen.hristev@microchip.com>

configs/at91sam9n12ek_mmc_defconfig

@@ -62,4 +62,4 @@ CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_ATMEL_HLCD=y
-CONFIG_LCD=y
+# CONFIG_LCD is not set

configs/at91sam9n12ek_nandflash_defconfig

@@ -63,4 +63,4 @@ CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_ATMEL_HLCD=y
-CONFIG_LCD=y
+# CONFIG_LCD is not set

configs/at91sam9n12ek_spiflash_defconfig

@@ -64,4 +64,4 @@ CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_ATMEL_HLCD=y
-CONFIG_LCD=y
+# CONFIG_LCD is not set