Remove Abseil checks from clang-tidy defaults.

Abseil is not available in Android, so these checks are not
actionable.

Test: Compiled frameworks/av, no more spurious warnings.
Change-Id: Ic573a3234a99b0fa1f63449e8d020a17a43a134c
diff --git a/cc/config/tidy.go b/cc/config/tidy.go
index 7c20dd5..c4563e2 100644
--- a/cc/config/tidy.go
+++ b/cc/config/tidy.go
@@ -31,7 +31,6 @@
 		}
 		checks := strings.Join([]string{
 			"-*",
-			"abseil-*",
 			"android-*",
 			"bugprone-*",
 			"cert-*",