Merge "Revert "Revert "Load env variables before c.config()""" into rvc-dev am: 9ecad7478f am: ecd9666a57 am: 2bdd2b278e am: 8341deb813

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

Change-Id: I55f517832526a1f4229ad93b33a8bed967346a71