Update TEST_MAPPING for VPN tests

Vpn tests are moved to FrameworksVpnTests, so the TEST_MAPPING
should be also updated.

Test: m
Change-Id: I9da0a93761dacf74c1a77862425fcf34d8cce877
Merged-In: I9da0a93761dacf74c1a77862425fcf34d8cce877
2 files changed