[usbdev/dv] Add usbctrl to known CSRs

The smoke test was failing there, and now it fails on the FIXME due to a
missing implementation.

Signed-off-by: Alexander Williams <awill@google.com>

hw/ip/usbdev/dv/env/usbdev_scoreboard.sv

diff --git a/hw/ip/usbdev/dv/env/usbdev_scoreboard.sv b/hw/ip/usbdev/dv/env/usbdev_scoreboard.sv
index 17400fb..b1c6da0 100644
--- a/hw/ip/usbdev/dv/env/usbdev_scoreboard.sv
+++ b/hw/ip/usbdev/dv/env/usbdev_scoreboard.sv
@@ -74,8 +74,11 @@
     // for read, update predication at address phase and compare at data phase
     case (csr.get_name())
       // add individual case item for each csr
+      "usbctrl": begin
+        // no special handling yet
+      end
       "intr_enable": begin
-        // no speical handling yet
+        // no special handling yet
       end
       "intr_test": begin
         if (write && channel == AddrChannel) begin