imx9: scmi: add i.MX95 SoC and clock related code

This patch adds i.MX95 SoC and clock related code. Because they are
based on SCMI, put them in the scmi subfolder.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Ji Luo <ji.luo@nxp.com>
Signed-off-by: Jindong Yue <jindong.yue@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ranjani Vaidyanathan <ranjani.vaidyanathan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
diff --git a/arch/sandbox/include/asm/scmi_test.h b/arch/sandbox/include/asm/scmi_test.h
index b30e536..c971711 100644
--- a/arch/sandbox/include/asm/scmi_test.h
+++ b/arch/sandbox/include/asm/scmi_test.h
@@ -110,7 +110,7 @@
 	size_t regul_count;
 };
 
-#ifdef CONFIG_SCMI_FIRMWARE
+#if IS_ENABLED(CONFIG_SCMI_FIRMWARE)
 /**
  * sandbox_scmi_channel_id - Get the channel id
  * @dev:	Reference to the SCMI protocol device