freescale/layerscape: Rename the config CONFIG_SECURE_BOOT name

Rename CONFIG_SECURE_BOOT to CONFIG_NXP_ESBC to avoid conflict
with UEFI secure boot.

Signed-off-by: Udit Agarwal <udit.agarwal@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/freescale/ls1043ardb/ls1043ardb.c b/board/freescale/ls1043ardb/ls1043ardb.c
index fbd9a26..9bc78d6 100644
--- a/board/freescale/ls1043ardb/ls1043ardb.c
+++ b/board/freescale/ls1043ardb/ls1043ardb.c
@@ -196,7 +196,7 @@
 	init_final_memctl_regs();
 #endif
 
-#ifdef CONFIG_SECURE_BOOT
+#ifdef CONFIG_NXP_ESBC
 	/* In case of Secure Boot, the IBR configures the SMMU
 	 * to allow only Secure transactions.
 	 * SMMU must be reset in bypass mode.