android-x86: fix building warnings of kitkat-x86

works also on arm platform, so...

Author:    Chih-Wei Huang <cwhuang@linux.org.tw>
Change-Id: Ic3ade475c5b92de26623e277170c71c49f9e41de
busybox-full: enable more applets

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