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>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 7438469..aa717bf 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -815,7 +815,7 @@
 
 	if (verify) {
 		puts("   Verifying Hash Integrity ... ");
-		if (!fit_image_check_hashes(fit, os_noffset)) {
+		if (!fit_image_verify(fit, os_noffset)) {
 			puts("Bad Data Hash\n");
 			bootstage_error(BOOTSTAGE_ID_FIT_CHECK_HASH);
 			return 0;
@@ -1169,7 +1169,7 @@
 
 		fit_print_contents(hdr);
 
-		if (!fit_all_image_check_hashes(hdr)) {
+		if (!fit_all_image_verify(hdr)) {
 			puts("Bad hash in FIT image!\n");
 			return 1;
 		}