service_context: split into platform and non-platform components.

Bug: 33746484
Test: Successfully boot with original service and property contexts.
      Successfully boot with split serivce and property contexts.

Change-Id: Ide67d37d85273c60b9e387e72fbeb87be6da306a
Signed-off-by: Sandeep Patil <sspatil@google.com>
diff --git a/reqd_mask/service_contexts b/reqd_mask/service_contexts
new file mode 100644
index 0000000..481967b
--- /dev/null
+++ b/reqd_mask/service_contexts
@@ -0,0 +1,3 @@
+# empty service_contexts file - this file is used to generate an empty
+# non-platform service_context for devices without any service_contexts
+# customizations.