arm64: dts: qcom: sa8775p: add a dedicated memory carveout for TZ

Add a 20MB reserved memory region for use by SCM calls.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20240527-shm-bridge-v10-15-ce7afaa58d3a@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sa8775p.dtsi

@@ -221,6 +221,7 @@ eud_in: endpoint {
 	firmware {
 		scm {
 			compatible = "qcom,scm-sa8775p", "qcom,scm";
+			memory-region = <&tz_ffi_mem>;
 		};
 	};
 
@@ -431,6 +432,12 @@ cdt_data_backup_mem: cdt-data-backup@91ba0000 {
 			no-map;
 		};
 
+		tz_ffi_mem: tz-ffi@91c00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x91c00000 0x0 0x1400000>;
+			no-map;
+		};
+
 		lpass_machine_learning_mem: lpass-machine-learning@93b00000 {
 			reg = <0x0 0x93b00000 0x0 0xf00000>;
 			no-map;