exfat: update latest from dorimanx exfat-nofuse

https://github.com/dorimanx/exfat-nofuse
block: support volname for HTC devices with proc/emmc support

gets data from emmc_partitions and write it down on mmcblk0pX partitions
this enables vold by-name mappings

Change-Id: I48007dad8ba7fbab301785710631200537686b68