Initial commit for usb daemon

usbd checks whether adb is enabled by default, if yes,
would start adbd and would call into usb hal to configure
usb gadget stack.

Bug: 63669128
Test: Verify that adb gets configured when enabled
Change-Id: If6d06cdadd6d93f181d56619142cbbb04d39a5cd
diff --git a/usbd/usbd.rc b/usbd/usbd.rc
new file mode 100644
index 0000000..c7838e8
--- /dev/null
+++ b/usbd/usbd.rc
@@ -0,0 +1,5 @@
+service usbd /system/bin/usbd
+    class late_start
+    oneshot
+    user root
+    group root usb