exfat: add dependency on nls-base

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 <[email protected]>

package/kernel/exfat/Makefile

@@ -36,6 +36,7 @@ define KernelPackage/fs-exfat
   TITLE:=exFAT kernel module
   FILES:=$(PKG_BUILD_DIR)/exfat.ko
   AUTOLOAD:=$(call AutoProbe,exfat)
+  DEPENDS:= +kmod-nls-base
 endef
 
 define KernelPackage/exfat/description