Enhance fit_check_sign to check all images

At present this tool only checks the configuration signing. Have it also
look at each of the images in the configuration and confirm that they
verify.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de> (v1)
diff --git a/common/image-fit.c b/common/image-fit.c
index 83fac9a..3311343 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1591,12 +1591,13 @@
 	}
 
 	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_CHECK_ARCH);
+#ifndef USE_HOSTCC
 	if (!fit_image_check_target_arch(fit, noffset)) {
 		puts("Unsupported Architecture\n");
 		bootstage_error(bootstage_id + BOOTSTAGE_SUB_CHECK_ARCH);
 		return -ENOEXEC;
 	}
-
+#endif
 	if (image_type == IH_TYPE_FLATDT &&
 	    !fit_image_check_comp(fit, noffset, IH_COMP_NONE)) {
 		puts("FDT image is compressed");