qcacld-3.0: Fix only nss 1x1 supported for 2 GHz 40M EHT MCS9
When DUT sta disconnect, bw_le_80_rx_max_nss_for_mcs_0_to_9 of 2 GHz eht
cap is set to 1, means only nss 1x1 supported for 2 GHz 40M EHT MCS9.
To fix it, don't change bw_le_80_rx_max_nss_for_mcs_0_to_9 when
disconnect, just change it during WFA case.
Change-Id: Ie96fbd77c473ac6d537517208fd799d7b648dc73
CRs-Fixed: 3670034