Build the gRPC Java library from source am: 2d04a32487 am: 3124595792 am: 25601000b1 am: 41afd754ef

Original change: https://android-review.googlesource.com/c/platform/external/grpc-grpc-java/+/1320727

Change-Id: I635621e0268a08b1c76372b0aced7f13dc878db1