IVGCVSW-7379 Add xxd package to build tool

Signed-off-by: Kevin May <kevin.may@arm.com>
Change-Id: I5ac1f1032cc2507ce0b8677a08e9debefab2779c
diff --git a/build-tool/scripts/install-packages.sh b/build-tool/scripts/install-packages.sh
index 64a3405..e043475 100755
--- a/build-tool/scripts/install-packages.sh
+++ b/build-tool/scripts/install-packages.sh
@@ -77,7 +77,8 @@
       make \
       scons \
       unzip \
-      wget
+      wget \
+      xxd
 
   # Install cross compile toolchains if host is x86_64
   if [ "$HOST_ARCH" == "x86_64" ]; then