Add a dependency on kmod-nls-base for the new exfat driver. Otherwise
the build fails on ramips and ath79 on kernel 5.4:
Package kmod-fs-exfat is missing dependencies for the following libraries:
nls_base.ko
Fixes commit cd41234d2f63 ("exfat: add out of tree module")
Signed-off-by: David Bauer <mail@david-bauer.net>
a4e72013e7