Update Android build files with license info

The downstream copy of SwiftShader in AOSP has license info changes:
https://android-review.googlesource.com/c/platform/external/swiftshader/+/1576044
This change cherry picks it into the upstream repo.

Also add natsu@ and schuffelen@ to OWNERS to retain their privileges
when we directly roll SwiftShader into AOSP.

Bug: skia:11901
Change-Id: Ibfba7640d0133740c38fc0f00d32fcb5e11f8a11
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/54148
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Macnak <natsu@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Commit-Queue: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/Android.bp b/src/Android.bp
index a59cd4f..ed1b022 100644
--- a/src/Android.bp
+++ b/src/Android.bp
@@ -14,6 +14,15 @@
 // limitations under the License.
 //
 
+package {
+    // http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // the below license kinds from "external_swiftshader_license":
+    //   SPDX-license-identifier-Apache-2.0
+    //   SPDX-license-identifier-BSD
+    default_applicable_licenses: ["external_swiftshader_license"],
+}
+
 cc_defaults {
     name: "libswiftshader",
     vendor: true,