m7spr: Add setup-makefiles.sh convenience script

Change-Id: I76c3e16db8149d97d5b076e01cbf0edfbc44ed24
diff --git a/setup-makefiles.sh b/setup-makefiles.sh
new file mode 100755
index 0000000..4deaeed
--- /dev/null
+++ b/setup-makefiles.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -e
+
+export DEVICE=m7spr
+export VENDOR=htc
+./../m7-common/setup-makefiles.sh $@