Add os_pickup.bp to induce scanning of vendor/qcom/opensource Android.bp's

os_pickup.bp will be symlinked as Android.bp at
vendor/qcom/opensource per manifest.xml; such that all Android.bp's
in 1 subdirectory under vendor/qcom/opensource will be scanned.

Change-Id: I262052bdc49470b590acdd57f9d5e002d2d0f980
diff --git a/os_pickup.bp b/os_pickup.bp
new file mode 100644
index 0000000..c620f14
--- /dev/null
+++ b/os_pickup.bp
@@ -0,0 +1,5 @@
+// Pick up Android.bp in next directory level
+
+optional_subdirs = [
+    "*",
+]