Add RoboSwitch driver interface for wpa_supplicant

Find attached the patch that creates a new driver: roboswitch. This
driver adds support for wired authentication with a Broadcom
RoboSwitch chipset. For example it is now possible to do wired
authentication with a Linksys WRT54G router running OpenWRT.

LIMITATIONS
- At the moment the driver does not support the BCM5365 series (though
adding it requires just some register tweaks).
- The driver is also limited to Linux (this is a far more technical
restriction).
- In order to compile against a 2.4 series you need to edit
include/linux/mii.h and change all references to "u16" in "__u16". I
have submitted a patch upstream that will fix this in a future version
of the 2.4 kernel. [These modifications (and more) are now included in
the kernel source and can be found in versions 2.4.37-rc2 and up.]

USAGE
- Usage is similar to the wired driver. Choose the interfacename of
the vlan that contains your desired authentication port on the router.
This name must be formatted as <interface>.<vlan>, which is the
default on all systems I know.

wpa_supplicant/doc/docbook/wpa_supplicant.conf.sgml

@@ -174,7 +174,8 @@ network={
 
       <listitem>
 	<para>Authentication for wired Ethernet. This can be used with
-       <emphasis>wired</emphasis> interface (-Dwired on command line).</para>
+        <emphasis>wired</emphasis> or <emphasis>roboswitch</emphasis> interface
+        (-Dwired or -Droboswitch on command line).</para>
 
 <blockquote><programlisting>
 ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=wheel

wpa_supplicant/doc/docbook/wpa_supplicant.sgml

@@ -309,6 +309,13 @@
 	</listitem>
       </varlistentry>
 
+      <varlistentry>
+	<term>roboswitch</term>
+	<listitem>
+	  <para>wpa_supplicant Broadcom switch driver</para>
+	</listitem>
+      </varlistentry>
+
       <varlistentry>
 	<term>bsd</term>
 	<listitem>