hardware: Add PowerBeam M5 620 XW 0xe885 device config

{{{
board.sysid=0xe885
board.cpurevision=0x00001122
board.name=PowerBeamM5
board.shortname=P5B
board.subtype=620
board.netmodes=7
board.hwaddr=0418D6AE868A
board.reboot=40
board.upgrade=150
board.phycount=1
board.phy.1.maxmtu=2024
board.phy.2.maxmtu=2024
radio.1.name=
radio.1.shortname=
radio.1.bus=ahb
radio.1.subsystemid=0xe885
radio.1.subvendorid=0x0777
radio.1.txpower.max=26
radio.1.txpower.offset=4
radio.1.antennas=2
radio.1.def_antenna=1
radio.1.antenna.1.id=1
radio.1.antenna.1.name=400
radio.1.antenna.1.gain=25
radio.1.antenna.2.id=2
radio.1.antenna.2.name=Feed only
radio.1.antenna.2.gain=3
}}}
ref AREDN->ticket:199

Change-Id: Iaafda611e08ca76507712fbd487b7b05cc254b84

files/www/cgi-bin/perlfunc.pm

@@ -1339,6 +1339,15 @@ sub hardware_info
             'usechains'       => 1,
             'rfband'          => '5800ubntus',
          },
+        '0xe885' => {
+            'name'            => 'PowerBeam M5 620 XW',
+            'comment'         => 'PowerBeam M5 620 XW',
+            'supported'       => '-1',
+            'maxpower'        => '22',
+            'pwroffset'       => '4',
+            'usechains'       => 1,
+            'rfband'          => '5800ubntus',
+         },
        '0xe8a5' => {
             'name'            => 'NanoStation Loco M5',
             'comment'         => 'NanoStation Loco M5',