sandbox: remove SCMI base node definition from test.dts

SCMI base protocol is mandatory and doesn't need to be listed in a device
tree.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 50c8715..c0ed2d8 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -732,10 +732,6 @@
 			#address-cells = <1>;
 			#size-cells = <0>;
 
-			protocol@10 {
-				reg = <0x10>;
-			};
-
 			clk_scmi: protocol@14 {
 				reg = <0x14>;
 				#clock-cells = <1>;