[LSC] Add LOCAL_LICENSE_KINDS to external/opencensus-java

Added SPDX-license-identifier-Apache-2.0 to:
  Android.bp
  api/Android.bp
  contrib/grpc_metrics/Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: I2a093f420186f13dd1602434dcffd7e1a36846c7
diff --git a/api/Android.bp b/api/Android.bp
index f939198..537d969 100644
--- a/api/Android.bp
+++ b/api/Android.bp
@@ -14,6 +14,15 @@
 //
 //
 
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "external_opencensus-java_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["external_opencensus-java_license"],
+}
+
 java_library {
     name: "opencensus-java-api",
     host_supported: true,
@@ -30,4 +39,4 @@
         "jsr305",
     ],
     sdk_version: "current",
-}
\ No newline at end of file
+}