Remove prebuild libril.so,add libril source ,remove libwfcu

N/A

Signed-off-by: huangqiwu <huangqiwu@xiaomi.com>
current .img size from MIUI V5

N/A

Fix fastboot flash system error
Signed-off-by: huangqiwu <huangqiwu@xiaomi.com>
Enable Bluetooth 4.0 (BLE)

N/A

Signed-off-by: huangqiwu <huangqiwu@xiaomi.com>