kernel: Remove CONFIG_UDF_NLS for kernel 4.19

kernel 4.18 removed the symbol and made NLS implicit.

Signed-off-by: Rosen Penev <[email protected]>

target/linux/generic/config-4.19

@@ -5300,7 +5300,6 @@ CONFIG_UBIFS_FS_FORMAT4=y
 # CONFIG_UCB1400_CORE is not set
 # CONFIG_UCSI is not set
 # CONFIG_UDF_FS is not set
-CONFIG_UDF_NLS=y
 CONFIG_UEVENT_HELPER=y
 CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
 # CONFIG_UFS_FS is not set