arm64: dts: qcom: msm8998: add compatible fallback to mailbox

MSM8998 mailbox is compatible with MSM8994.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230322174148.810938-6-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/msm8998.dtsi

@@ -2489,7 +2489,8 @@ glink-edge {
 		};
 
 		apcs_glb: mailbox@17911000 {
-			compatible = "qcom,msm8998-apcs-hmss-global";
+			compatible = "qcom,msm8998-apcs-hmss-global",
+				     "qcom,msm8994-apcs-kpss-global";
 			reg = <0x17911000 0x1000>;
 
 			#mbox-cells = <1>;