Adding Exfat samsung's drivers
File mode changed
drivers: exfat: adding samsung opensource drivers thanks Sammy for making them Open! Really!

Signed-off-by: umberto1978 <ur.tecnotop@gmail.com>
Enabled exfat in defconfig (but something missing is happened, i need investigate further......)
drivers: adding j4fs (missing)

Signed-off-by: umberto1978 <ur.tecnotop@gmail.com>