cros/components/proximity_auth: Remove cryptauth references from unittest.

These are unnecessary and caused the cryptauth tests to be run twice
when running all test binaries.

R=hansberry@chromium.org

Bug: none
Test: none
Change-Id: I006eaa35234a11bc4366a5020369d64d4f119f1c
Reviewed-on: https://chromium-review.googlesource.com/1014401Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551117}

chromeos/components/proximity_auth/BUILD.gn

@@ -115,8 +115,6 @@ source_set("unit_tests") {
     "//chromeos/components/proximity_auth/logging",
     "//chromeos/components/proximity_auth/logging:unit_tests",
     "//components/cryptauth:test_support",
-    "//components/cryptauth:unit_tests",
-    "//components/cryptauth/ble",
     "//components/prefs:test_support",
     "//components/sync_preferences:test_support",
     "//device/bluetooth:mocks",