imx: use generic name ele(EdgeLockSecure Enclave)

Per NXP requirement, we rename all the NXP EdgeLock Secure Enclave
code including comment, folder and API name to ELE to align.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index 0c13075..2a222c5 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -92,8 +92,8 @@
 	struct udevice *scu_dev;
 #endif
 
-#ifdef CONFIG_IMX_SENTINEL
-	struct udevice *s400_dev;
+#ifdef CONFIG_IMX_ELE
+	struct udevice *ele_dev;
 	u32 soc_rev;
 	u32 lifecycle;
 	u32 uid[4];