init: interactive changes

* disable io_is_busy
* configure target up/down loads

Change-Id: Ice2e1b796395b4fdc79899ae4c1199820244b2c5
cmdline: enable zcache

Change-Id: I4d0b9a268e2f23d55b904130e54579c30bea114a
Merge "init: interactive changes" into cm-11.0