Android 6.0 删除MTP模式

device/rockchip/common/device.mk

 else
 PRODUCT_PROPERTY_OVERRIDES +=       \
     ro.factory.hasUMS=false         \
-    persist.sys.usb.config=mtp,adb  \
+    persist.sys.usb.config=adb      \
     testing.mediascanner.skiplist = /mnt/shell/emulated/Android/

 PRODUCT_COPY_FILES += \