video: add STM32 LTDC display controller

The STM32 LTDC display controller provides a parallel digital RGB and
signals for horizontal, vertical synchronization, Pixel Clock and Data
Enable as output to interface directly to a variety of LCD and TFT panels.

The LTDC main features are:
- 24-bit RGB Parallel Pixel Output, Programmable timings & polarity for
  HSync, VSync and Data Enable.
- 2 layers with Blending, Color Keying, Window position & size,
  Dithering, Background color, Color Look-Up Table (CLUT).
- Supported layer color formats: ARGB8888, RGB888, RGB565, ARGB1555,
  ARGB4444, L8 CLUT, AL44 & AL88

This LTDC driver:
- supports: RGB parallel output with timings & polarity, 1 layer
  in RGB565.
- supports but with hard-coded configurations: blending, window
  position & size (crop), background color.
- does not support yet: rgb888, argb8888, 8-bit clut, dithering.

This LTDC driver is compatible with all stm32 platforms with the
LTDC IP and has been tested on stm32 f746-disco board.

Signed-off-by: Philippe CORNU <philippe.cornu@st.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 40a656e..9c6430c 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -457,6 +457,8 @@
 	  console device and can display stdout output. Within U-Boot is is
 	  a normal bitmap display and can display images as well as text.
 
+source "drivers/video/stm32/Kconfig"
+
 config VIDEO_TEGRA20
 	bool "Enable LCD support on Tegra20"
 	depends on OF_CONTROL