Update vpnprofilestore_test to legacykeystore_test in TEST_MAPPING am: 8fb041e08f am: 9ef80ea52e am: 0fd76cf26d am: 466508ed91

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand_chacha/+/1755992

Change-Id: If22131e845f2feab133abc6075e925957330c80a