dt-bindings: serial: samsung: add samsung,exynos2200-uart compatible

Add dedicated samsung,exynos2200-uart compatible to the dt-schema for
representing uart of the exynos2200.

Like GS101, it has a required DT property samsung,uart-fifosize and
exhibits the 32 bit register access limit, so reuse support for it.

Signed-off-by: Ivaylo Ivanov <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/serial/samsung_uart.yaml

···
           - samsung,exynos8895-uart
       - items:
           - enum:
+              - samsung,exynos2200-uart
+          - const: google,gs101-uart
+      - items:
+          - enum:
               - samsung,exynos7-uart
               - tesla,fsd-uart
           - const: samsung,exynos4210-uart