Remove explicit configfs mount.

The rootdir/init.rc file has been doing this itself for a while.
This tidies up an error message printed by init.

Bug: 110097226
Change-Id: I42978473ebb4a21fb31a14cbf1c925e0efc7c696
diff --git a/shared/config/init.hardware.usb.rc b/shared/config/init.hardware.usb.rc
index c3bb74c..df180dc 100644
--- a/shared/config/init.hardware.usb.rc
+++ b/shared/config/init.hardware.usb.rc
@@ -15,7 +15,6 @@
 #
 
 on boot
-    mount configfs none /config
     mkdir /config/usb_gadget/g1 0770 shell shell
     mkdir /config/usb_gadget/g1/strings/0x409 0770 shell shell
     write /config/usb_gadget/g1/bcdUSB 0x0200