image: Rename fit_image_check_hashes() to fit_image_verify()

This is the main entry point to the FIT image verification code. We will
be using it to handle image verification with signatures, so rename the
function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

common/update.c

@@ -297,7 +297,7 @@ got_update_file:
 		printf("Processing update '%s' :",
 			fit_get_name(fit, noffset, NULL));
 
-		if (!fit_image_check_hashes(fit, noffset)) {
+		if (!fit_image_verify(fit, noffset)) {
 			printf("Error: invalid update hash, aborting\n");
 			ret = 1;
 			goto next_node;