Add ble sysprop for vnd_included

The original BLE_VND_INCLUDED define method cannot be override
on runtime and some targets need to disable this feature(Eg: hikey960 board)

Test: m .
Test: bluetooth enabled by default after boot with the hikey960 board
Bug: 302408538

Change-Id: I6da644a22056c8198b0dcd63b98c12fe829d487f
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>