exfat: sync'ed to latest driver from https://github.com/dorimanx/exfat-nofuse

thanks to @dorimanx and others who have contributed to exfat
development

at this patch are included the next patches:
exfat: sync'ed
to latest driver from https://github.com/dorimanx/exfat-nofuse -
https://github.com/faux123/htc_m8/commit/fee28c3c50e98e41df7d58160255d617cc76a32f
exfat:
hacked name for HTC's hardcoded vold -
https://github.com/faux123/htc_m8/commit/707a430442cdc6ee3044d6ee7bc1e7408d29df74
exfat:
more HTC vold mount option hacks! -
https://github.com/faux123/htc_m8/commit/d32ed6ea246342743a84036dfce3f185b16506c0
exfat:
change printk to debug printk to reduce dmesg spam/flood -
https://github.com/faux123/htc_m8/commit/29215ef16a7b6c841f2a4c0f08b65d4bad9275c9
exfat:
fix derpy #defines -
https://github.com/faux123/htc_m8/commit/85188b7f204dccb326754672e3573c51a5ce4f2e
exfat:
more #define fix ups -
https://github.com/faux123/htc_m8/commit/835e6b3bd4ad88849e61aca6df81d97289da5c9b
exfat:
clean up old remanent -
https://github.com/faux123/htc_m8/commit/1e3241175331fecfefa14098da3a5e032b6a6192