SPL: Default to disabling legacy image support when using FIT

When we have a FIT image being used by SPL by default that means the
most common case is that we'll never run into a legacy image.  Disable
legacy image support by default in that case to reclaim space.
Signed-off-by: NTom Rini <trini@konsulko.com>

common/spl/Kconfig

@@ -158,7 +158,7 @@ config SPL_RAW_IMAGE_SUPPORT
 
 config SPL_LEGACY_IMAGE_SUPPORT
 	bool "Support SPL loading and booting of Legacy images"
-	default y if !TI_SECURE_DEVICE
+	default y if !TI_SECURE_DEVICE && !SPL_LOAD_FIT
 	help
 	  SPL will support loading and booting Legacy images when this option
 	  is y. If this is not set, SPL will move on to other available