imx: replace CONFIG_SECURE_BOOT with CONFIG_IMX_HAB

CONFIG_SECURE_BOOT is too generic and forbids to use it for cross
architecture purposes. If Secure Boot is required for imx, this means to
enable and use the HAB processor in the soc.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/configs/warp7_bl33_defconfig b/configs/warp7_bl33_defconfig
index 80accfb..9d161f3 100644
--- a/configs/warp7_bl33_defconfig
+++ b/configs/warp7_bl33_defconfig
@@ -1,7 +1,7 @@
 CONFIG_ARM=y
 CONFIG_ARCH_MX7=y
 CONFIG_SYS_TEXT_BASE=0x87800000
-CONFIG_SECURE_BOOT=y
+CONFIG_IMX_HAB=y
 CONFIG_TARGET_WARP7=y
 CONFIG_ARMV7_BOOT_SEC_DEFAULT=y
 CONFIG_FIT=y