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/board/boundary/nitrogen6x/nitrogen6q2g.cfg b/board/boundary/nitrogen6x/nitrogen6q2g.cfg
index 5ff3eed..e5e923d 100644
--- a/board/boundary/nitrogen6x/nitrogen6q2g.cfg
+++ b/board/boundary/nitrogen6x/nitrogen6q2g.cfg
@@ -19,7 +19,7 @@
 
 #define __ASSEMBLY__
 #include <config.h>
-#ifdef CONFIG_SECURE_BOOT
+#ifdef CONFIG_IMX_HAB
 CSF CONFIG_CSF_SIZE
 #endif
 #include "asm/arch/mx6-ddr.h"