smb: client: Deduplicate "select NETFS_SUPPORT" in Kconfig

Repeating automatically selected options in Kconfig files is redundant, so
let's delete repeated "select NETFS_SUPPORT" that was added accidentally.

Fixes: 69c3c023 ("cifs: Implement netfslib hooks")
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Signed-off-by: Steve French <stfrench@microsoft.com>