kernel: deactivate fs cache config option

r40587 added some kernel config options, on which these two ones depend.
This fixes the build of the buildbots.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40588 3c298f89-4303-0410-b956-a3cf2f4a3e73