dt-bindings: panel-simple: Add compatible for Sharp LS020B1DD01D

Add a compatible string for the Sharp LS020B1DD01D 2" HQVGA TFT LCD
panel, and remove the old sharp,ls020b1dd01d.txt documentation which is
now obsolete.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200109003000.119516-2-paul@crapouillou.net

Documentation/devicetree/bindings/display/panel/panel-simple.yaml

@@ -37,6 +37,8 @@ properties:
       - auo,b116xa01
         # GiantPlus GPM940B0 3.0" QVGA TFT LCD panel
       - giantplus,gpm940b0
+        # Sharp LS020B1DD01D 2.0" HQVGA TFT LCD panel
+      - sharp,ls020b1dd01d
 
   backlight: true
   enable-gpios: true

Documentation/devicetree/bindings/display/panel/sharp,ls020b1dd01d.txt

-Sharp 2.0" (240x160 pixels) 16-bit TFT LCD panel
-
-Required properties:
-- compatible: should be "sharp,ls020b1dd01d"
-- power-supply: as specified in the base binding
-
-Optional properties:
-- backlight: as specified in the base binding
-- enable-gpios: as specified in the base binding
-
-This binding is compatible with the simple-panel binding, which is specified
-in simple-panel.txt in this directory.