build(rcar-layout): split combined targets

This is a small change to split up the generation of the R-Car layout
images into unique targets. This is predominantly for cleanliness
reasons - Make current doesn't know about the `.bin` and `.srec`
binaries generated by the `.elf` target.

Change-Id: I624bc0c62e99cead66a6d6e25ff016aecf6b985a
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/changelog.yaml b/changelog.yaml
index 5655603..302546e 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -1428,6 +1428,12 @@
       - title: Marvell Tools
         scope: marvell-tools
 
+      - title: Renesas Tools
+        scope: renesas-tools
+
+        subsections:
+          - title: R-Car Layout Tool
+            scope: rcar-layout
   - title: Dependencies
     scope: deps