dt-bindings: display: himax-hx8394: Add Microchip AC40T08A MIPI Display panel

Add compatible string for the Microchip's AC40T08A MIPI Display
panel.This panel uses a Himax HX8394 display controller.
The reset line is not populated and leads to driver probe issues,
thus add conditional block to narrow reset-gpio property per variant.
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240701085837.50855-2-manikandan.m@microchip.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240701085837.50855-2-manikandan.m@microchip.com

Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml

@@ -15,14 +15,12 @@ description:
   such as the HannStar HSD060BHW4 720x1440 TFT LCD panel connected with
   a MIPI-DSI video interface.
 
-allOf:
-  - $ref: panel-common.yaml#
-
 properties:
   compatible:
     items:
       - enum:
           - hannstar,hsd060bhw4
+          - microchip,ac40t08a-mipi-panel
           - powkiddy,x55-panel
       - const: himax,hx8394
 
@@ -46,7 +44,6 @@ properties:
 required:
   - compatible
   - reg
-  - reset-gpios
   - backlight
   - port
   - vcc-supply
@@ -54,6 +51,18 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - $ref: panel-common.yaml#
+  - if:
+      not:
+        properties:
+          compatible:
+            enum:
+              - microchip,ac40t08a-mipi-panel
+    then:
+      required:
+        - reset-gpios
+
 examples:
   - |
     #include <dt-bindings/gpio/gpio.h>