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

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

Change-Id: I7ebf5bccaf33afa666eb593e3abffaad818e61a3