Make a board-base to be included by all boards
diff --git a/board-base.mk b/board-base.mk
new file mode 100644
index 0000000..c9cb49a
--- /dev/null
+++ b/board-base.mk
@@ -0,0 +1,2 @@
+TARGET_SYSTEM_PROP := device/phh/treble/system.prop $(TARGET_SYSTEM_PROP)
+BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := device/phh/treble/bluetooth