scripts: use sep-char for hash nodes

U-Boot with enabled secure-boot will not boot images with the
@-character used for hash node-names.

Use the existing separation character configurable for each device.

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit 2b133ab)

scripts/mkits.sh

@@ -103,10 +103,10 @@ if [ -n "${DTB}" ]; then
 			${DTADDR:+load = <${DTADDR}>;}
 			arch = \"${ARCH}\";
 			compression = \"none\";
-			hash@1 {
+			hash${REFERENCE_CHAR}1 {
 				algo = \"crc32\";
 			};
-			hash@2 {
+			hash${REFERENCE_CHAR}2 {
 				algo = \"${HASH}\";
 			};
 		};
@@ -123,10 +123,10 @@ if [ -n "${INITRD}" ]; then
 			type = \"ramdisk\";
 			arch = \"${ARCH}\";
 			os = \"linux\";
-			hash@1 {
+			hash${REFERENCE_CHAR}1 {
 				algo = \"crc32\";
 			};
-			hash@2 {
+			hash${REFERENCE_CHAR}2 {
 				algo = \"${HASH}\";
 			};
 		};
@@ -145,10 +145,10 @@ if [ -n "${ROOTFS}" ]; then
 			type = \"filesystem\";
 			arch = \"${ARCH}\";
 			compression = \"none\";
-			hash@1 {
+			hash${REFERENCE_CHAR}1 {
 				algo = \"crc32\";
 			};
-			hash@2 {
+			hash${REFERENCE_CHAR}2 {
 				algo = \"${HASH}\";
 			};
 		};
@@ -174,10 +174,10 @@ OVCONFIGS=""
 			type = \"flat_dt\";
 			arch = \"${ARCH}\";
 			compression = \"none\";
-			hash@1 {
+			hash${REFERENCE_CHAR}1 {
 				algo = \"crc32\";
 			};
-			hash@2 {
+			hash${REFERENCE_CHAR}2 {
 				algo = \"${HASH}\";
 			};
 		};
@@ -209,10 +209,10 @@ DATA="/dts-v1/;
 			compression = \"${COMPRESS}\";
 			load = <${LOAD_ADDR}>;
 			entry = <${ENTRY_ADDR}>;
-			hash@1 {
+			hash${REFERENCE_CHAR}1 {
 				algo = \"crc32\";
 			};
-			hash@2 {
+			hash${REFERENCE_CHAR}2 {
 				algo = \"$HASH\";
 			};
 		};