exFAT support

Signed-off-by: flar2 <asegaert@gmail.com>
exfat: hacked name for HTC's hardcoded vold

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: flar2 <asegaert@gmail.com>
exfat: more HTC vold mount option hacks!

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: flar2 <asegaert@gmail.com>