Fix running of all.sh on macOS

Was getting 'dd: unknown operand status'

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index cc11dcf..f293127 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -3111,7 +3111,7 @@
     local dd_cmd
     dd_cmd=(dd if=/dev/urandom of=./tests/seedfile bs=64 count=1)
     case $OSTYPE in
-        linux*|freebsd*|openbsd*|darwin*) dd_cmd+=(status=none)
+        linux*|freebsd*|openbsd*) dd_cmd+=(status=none)
     esac
     "${dd_cmd[@]}"