video: add nexell video driver (display/video driver)

Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- nexell_display.c: Changed to DM, CONFIG_FB_ADDR can not be used
  anymore because framebuffer is allocated by video_reserve() in
  video-uclass.c. Therefore code changed appropriately.
- '#ifdef CONFIG...' changed to 'if (IS_ENABLED(CONFIG...))' where
  possible (and similar).
- livetree API (dev_read_...) is used instead of fdt one (fdt...).

Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
diff --git a/drivers/video/nexell/Kconfig b/drivers/video/nexell/Kconfig
new file mode 100644
index 0000000..54b8ccb
--- /dev/null
+++ b/drivers/video/nexell/Kconfig
@@ -0,0 +1,27 @@
+if VIDEO_NX
+
+menu "LCD select"
+
+config VIDEO_NX_RGB
+	bool "RGB LCD"
+	help
+	  Support for RGB lcd output.
+
+config VIDEO_NX_LVDS
+	bool "LVDS LCD"
+	help
+	  Support for LVDS lcd output.
+
+config VIDEO_NX_MIPI
+	bool "MiPi"
+	help
+	  Support for MiPi lcd output.
+
+config VIDEO_NX_HDMI
+	bool "HDMI"
+	help
+	  Support for hdmi output.
+
+endmenu
+
+endif