added Huawei P9 Plus https://sourceforge.net/p/libmtp/feature-requests/173/
added Huawei P9 Plus
https://sourceforge.net/p/libmtp/feature-requests/173/

libmtp/libmtp,philipl/libmtp,philipl/libmtp,philipl/libmtp,libmtp/libmtp,libmtp/libmtp