Update vpnprofilestore_test to legacykeystore_test in TEST_MAPPING am: eeb6be2901 am: 4107fade78 am: a6f3625c20 am: 3d8624d77b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cexpr/+/1756437

Change-Id: I885ab2a5f3b21528330a84c9dd4bfaf6761242ca