Merge "Revert "Revert "Load env variables before c.config()""" into rvc-dev...

Merge "Revert "Revert "Load env variables before c.config()""" into rvc-dev am: 9ecad747 am: ecd9666a am: 2bdd2b27

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/15778291

Change-Id: I5fcaf5c206fda035d1b7934730b03dd08d1ec048