envsetup: fix for provision to work on zsh
envsetup: fix for provision to work on zsh

The -p option means something else on zsh and breaks this function.

Bug: None
Change-Id: Ie0ba8119e34c616f5b8f931806063d6b1d3d893e

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build