fs: exfat: Inhibit unused exfat_humanize_bytes() and exfat_print_info()

Make sure unused exfat_humanize_bytes() and exfat_print_info()
functions are not compiled into U-Boot code base. This also removes
CID 550300:  Integer handling issues  (INTEGER_OVERFLOW)
in exfat_humanize_bytes() , which is now surely unreachable.

Signed-off-by: Marek Vasut <marex@denx.de>
2 files changed