Makefile: Update minimum dtc version to 1.4.3

With support for overlays and calling the -@ flag to dtc we need to have
at least 1.4.3 available now.

Cc: Simon Glass <sjg@chromium.org>
Reported-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Tom Rini <trini@konsulko.com>

Makefile

@@ -1448,8 +1448,8 @@ System.map:	u-boot
 		@$(call SYSTEM_MAP,$<) > $@
 
 checkdtc:
-	@if test $(call dtc-version) -lt 0104; then \
-		echo '*** Your dtc is too old, please upgrade to dtc 1.4 or newer'; \
+	@if test $(call dtc-version) -lt 010403; then \
+		echo '*** Your dtc is too old, please upgrade to dtc 1.4.3 or newer'; \
 		false; \
 	fi
 

scripts/dtc-version.sh

@@ -2,8 +2,8 @@
 #
 # dtc-version dtc-command
 #
-# Prints the dtc version of `dtc-command' in a canonical 4-digit form
-# such as `0222' for binutils 2.22
+# Prints the dtc version of `dtc-command' in a canonical 6-digit form
+# such as `010404'  for dtc 1.4.4
 #
 
 dtc="$*"
@@ -16,5 +16,6 @@ fi
 
 MAJOR=$($dtc -v | head -1 | awk '{print $NF}' | cut -d . -f 1)
 MINOR=$($dtc -v | head -1 | awk '{print $NF}' | cut -d . -f 2)
+PATCH=$($dtc -v | head -1 | awk '{print $NF}' | cut -d . -f 3 | cut -d - -f 1)
 
-printf "%02d%02d\\n" $MAJOR $MINOR
+printf "%02d%02d%02d\\n" $MAJOR $MINOR $PATCH