misc: S400_API: Rename imx8ulp_s400_msg to sentinel_msg

Use more generic name for S40x msg structure

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx9/trdc.c b/arch/arm/mach-imx/imx9/trdc.c
index b088169..3f37ce7 100644
--- a/arch/arm/mach-imx/imx9/trdc.c
+++ b/arch/arm/mach-imx/imx9/trdc.c
@@ -315,7 +315,7 @@
 int release_rdc(u8 xrdc)
 {
 	ulong s_mu_base = 0x47520000UL;
-	struct imx8ulp_s400_msg msg;
+	struct sentinel_msg msg;
 	int ret;
 	u32 rdc_id;