build: ota: Support for install tools in /tmp/install
* Anything in OUT/install gets packaged up into the zip and extracted to /tmp/install immediately after FullOTA_InstallBegin. * Use /tmp/install in edify scripts and remove code related to using and manipulating /system for install tools. Change-Id: I315a3238e36c8d15e26f935e272f7e27dd59c320
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