Docs: Fix "USB peripheral/host mode" table row

This was missing a column, which shows every item except the first to
the left by one.  Particulary misleading since it looks like the SHOULD
requirements are for

WATCH
AUTOMOTIVE

When they should be for

HANDHELD
AUTOMOTIVE
OTHER

Test: python make_cdd.py --version 7.1 --branch master
Change-Id: If1019c35f7992c40f0bf1bc086dba8d68072ed45
diff --git a/2_device-types/2_1_device-configurations.md b/2_device-types/2_1_device-configurations.md
index a44309b..f975e6d 100644
--- a/2_device-types/2_1_device-configurations.md
+++ b/2_device-types/2_1_device-configurations.md
@@ -110,6 +110,7 @@
     <td></td>
  </tr>
  <tr>
+    <td>USB</td>
     <td>USB peripheral/host mode</td>
     <td><a href="#7_7_usb">7.7. USB</a></td>
     <td>SHOULD</td>