dt-bindings: display: simple: Add Satoz panel

Satoz is a Chinese TFT manufacturer.
Website: http://www.sat-sz.com/English/index.html

Add the compatible for its SAT050AT40H12R2 5.0 inch LCD panel.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200109184037.9091-1-miquel.raynal@bootlin.com

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

@@ -39,6 +39,8 @@ properties:
       - boe,nv140fhmn49
         # GiantPlus GPM940B0 3.0" QVGA TFT LCD panel
       - giantplus,gpm940b0
+        # Satoz SAT050AT40H12R2 5.0" WVGA TFT LCD panel
+      - satoz,sat050at40h12r2
         # Sharp LS020B1DD01D 2.0" HQVGA TFT LCD panel
       - sharp,ls020b1dd01d