Merge "Allow currysrc users to override srcgen and output directories" am: 0ed3bdf3d4 am: e7290b44c9

Original change: https://android-review.googlesource.com/c/platform/tools/currysrc/+/1555397

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iddb4fad587d0b521355cb79bece4c6e50909249c