If existing STA+STA is MLO STA, the current HW mode is not
reliable because the STA link maybe inactive. HW mode may
change if MLO STA becomes active.
Add special handling to this case by checking MAC frequency
range to decide DBS or SBS.
Change-Id: I4d3728965d2f687805535abb0716bb1b58e1c51d
CRs-Fixed: 3328517