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/include/asm/mach-imx/s400_api.h b/arch/arm/include/asm/mach-imx/s400_api.h
index dc176e1..89fa373 100644
--- a/arch/arm/include/asm/mach-imx/s400_api.h
+++ b/arch/arm/include/asm/mach-imx/s400_api.h
@@ -26,7 +26,7 @@
 
 #define S400_MAX_MSG          255U
 
-struct imx8ulp_s400_msg {
+struct sentinel_msg {
 	u8 version;
 	u8 size;
 	u8 command;