In ACS, SAP phymode is updated as per the ACS request, but actual
phymode is calculated during start bss, which check the IEs etc.
In pe session the ht/vht/he/eht capability flags are not updated
as per the new phymode/dot11mode and thus even if phymode is
11ac, he flag is set and send he caps to firmware.
So once SAP is started, don't allow phymode update from ACS.
Also update the ht/vht/he/eht capability as per the new dot11mode
so that there is no mismatch in dot11mode and
ht/vht/he/eht capability flag.
CRs-Fixed: 3696205
Change-Id: I73e5f8ed0fbdc17b423bcba6fd3cbf2acc221fc2
a3b98ba725