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/configs/ls1028aqds_tfa_SECURE_BOOT_defconfig b/configs/ls1028aqds_tfa_SECURE_BOOT_defconfig
index 3170d81..267fc0d 100644
--- a/configs/ls1028aqds_tfa_SECURE_BOOT_defconfig
+++ b/configs/ls1028aqds_tfa_SECURE_BOOT_defconfig
@@ -2,7 +2,7 @@
 CONFIG_TARGET_LS1028AQDS=y
 CONFIG_TFABOOT=y
 CONFIG_SYS_MALLOC_F_LEN=0x6000
-CONFIG_SECURE_BOOT=y
+CONFIG_NXP_ESBC=y
 CONFIG_SYS_FSL_SDHC_CLK_DIV=1
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT=y