video: hx8394: Add panel driver for hannstar,hsd060bhw4

The driver is for panels based on the Himax HX8394 controller, such as the
HannStar HSD060BHW4 720x1440 TFT LCD panel that uses a MIPI-DSI interface.
This panel is used in Pinephone Pro.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Cc: Anatolij Gustschin <agust@denx.de>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 4976295..b209cb7 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -477,6 +477,14 @@
 	  using the same DSI command sequence. The panel has a 720x1280
 	  resolution and uses 24 bit RGB per pixel.
 
+config VIDEO_LCD_HIMAX_HX8394
+	bool "Himax HX8394 DSI LCD panel support"
+	depends on PANEL && BACKLIGHT
+	select VIDEO_MIPI_DSI
+	help
+	Say Y here if you want to enable support for Himax HX8394
+	dsi 4dl panel.
+
 config VIDEO_LCD_ORISETECH_OTM8009A
 	bool "OTM8009A DSI LCD panel support"
 	select VIDEO_MIPI_DSI