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/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 04460f1..b9f5c7a 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -364,8 +364,8 @@
 	  To compile this driver as a module, choose M here: the module
 	  will be called npcm_otp.
 
-config IMX_SENTINEL
-	bool "Enable i.MX Sentinel MU driver and API"
+config IMX_ELE
+	bool "Enable i.MX EdgeLock Enclave MU driver and API"
 	depends on MISC && (ARCH_IMX9 || ARCH_IMX8ULP)
 	help
 	  If you say Y here to enable Message Unit driver to work with