iw: Add VHT info in link query
iw: Add VHT info in link query

Show VHT mcs, nss and bw, if present, in
iw dev link.

Eg.,
Connected to 10:6f:3f:4d:94:b4 (on mlan0)
        SSID: 122920
        freq: 5180
        RX: 0 bytes (0 packets)
        TX: 88 bytes (1 packets)
        signal: -51 dBm
        tx bitrate: 650.0 MBit/s VHT-MCS 7 80Mhz short GI VHT-NSS 2

        bss flags:
        dtim period:    1
        beacon int:     100

Signed-off-by: Yogesh Ashok Powar <72fc4bdfe66b24dbf1c753704fcd1fc87afcdc80@marvell.com>
[also fix existing Mhz to MHz]
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

bw-oss/iw,bw-oss/iw,greearb/iw-ct,CTU-IIG/802.11p-iw,cozybit/iw,Distrotech/iw,cozybit/iw,Distrotech/iw,chunyeow/iw,greearb/iw-ct,CTU-IIG/802.11p-iw,chunyeow/iw