android-x86: fix building warnings of kitkat-x86
busybox-full: enable more applets

 chvt, deallocvt, fgconsole
 findfs, hwclock, lspci, nmeter
 openvt, powertop, rdate, setkeycodes
 smemcap, switch_root, tty

Change-Id: Ib0655715897f4088a81efb4ca74731b60c14ac23