Cleanup cargo2android configs and patches am: b954363880 am: 15db1f730e am: 933a44018e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-compiler/+/2751203

Change-Id: I2dfafc6b266300bef3016afffdc4e9f6d5fb4048
Signed-off-by: Automerger Merge Worker <[email protected]>