SDK: pass $HOST_OUT variable to atree.
SDK: pass $HOST_OUT variable to atree.

Required by Change Id623bbef45 in development.git

Change-Id: I43229f1e6aaeea176df92a499b9cda3237fb36b9

Hybrid-Power/startsync,RR-msm7x30/platform_manifest,xorware/android_build,xorware/android_build,hagar006/platform_manifest,xorware/android_build,see4ri/lolili,fallouttester/platform_manifest,ND-3500/platform_manifest,xorware/android_build,knone1/platform_manifest,pranav01/platform_manifest,xorware/android_build