sandbox: add SCMI clock control permissions to sandbox

This patch is used to add SCMI clock control permissions to sandbox for
testing.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
diff --git a/arch/sandbox/include/asm/scmi_test.h b/arch/sandbox/include/asm/scmi_test.h
index 619f8f5..b30e536 100644
--- a/arch/sandbox/include/asm/scmi_test.h
+++ b/arch/sandbox/include/asm/scmi_test.h
@@ -27,10 +27,12 @@
  * @id:		Identifier of the clock used in the SCMI protocol
  * @enabled:	Clock state: true if enabled, false if disabled
  * @rate:	Clock rate in Hertz
+ * @perm:	Indicating state/parent/rate permission
  */
 struct sandbox_scmi_clk {
 	bool enabled;
 	ulong rate;
+	u32 perm;
 };
 
 /**