Add apex_test for mixed builds

Test: go test soong tests
Change-Id: I33327e1fe7d6a4bbf32890d9fbd5453c28a9c5b1
diff --git a/android/bazel_handler.go b/android/bazel_handler.go
index 1f87410..2524370 100644
--- a/android/bazel_handler.go
+++ b/android/bazel_handler.go
@@ -250,7 +250,8 @@
 }
 
 func (m MockBazelContext) GetApexInfo(label string, _ configKey) (cquery.ApexInfo, error) {
-	panic("unimplemented")
+	result, _ := m.LabelToApexInfo[label]
+	return result, nil
 }
 
 func (m MockBazelContext) GetCcUnstrippedInfo(label string, _ configKey) (cquery.CcUnstrippedInfo, error) {