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: dd28ec51 am: ea62b3d7 am: afe8619e

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

Change-Id: Ia17a5c2aa52856a81e3a630e2d15c859c555ebca