Allow mediaprovider to find the camera server.

Fixed SELinux denials when trying to render the camera preview
to a texture in an internal test app. See the bug for additional
information.

Bug: 183749637
Test: Ran the internal test app, doesn't crash anymore.
Change-Id: I8fb62be424cd91c46cada55bb23db1624707997d
diff --git a/private/mediaprovider.te b/private/mediaprovider.te
index 978ae2a..78bbdb0 100644
--- a/private/mediaprovider.te
+++ b/private/mediaprovider.te
@@ -24,6 +24,7 @@
 
 allow mediaprovider app_api_service:service_manager find;
 allow mediaprovider audioserver_service:service_manager find;
+allow mediaprovider cameraserver_service:service_manager find;
 allow mediaprovider drmserver_service:service_manager find;
 allow mediaprovider mediaextractor_service:service_manager find;
 allow mediaprovider mediaserver_service:service_manager find;