When vht cap indicates the vht max MPDU size >= 7991 supported,
ht cap A-MSDU length field should indicate 7935 octets
supported according to 80211 specification.
At present no WMI HT cap defined for ht cap A-MSDU length field
from target.
Fix the issue by override ht amsdu len to 1 if vht max mpdu
len >= 7991 supported by target.
Change-Id: I9d2b8c11e7a27e016f618c1a2c8a380d081a6ba7
CRs-Fixed: 2929148
edd0baca7d