Change mount point for USB storage

Change-Id: Ibff148611310b8de8259c16d067e80fc399d14fb
Update kernel prebuilt for Unicode support on FAT/NTFS filesystems

Change-Id: I65ca8f05b828a6f6dd57094c7da36781a78dbe64
Add support for USB tethering

Change-Id: Ib3f192bad04aa77b7617ec3561807872172c0139