kernel: add a few missing config symbols for x86. added to generic config...

kernel: add a few missing config symbols for x86. added to generic config because of dependencies, so that kernel_menuconfig does not remove them again

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33923 3c298f89-4303-0410-b956-a3cf2f4a3e73