The current function doesn't handle "hw_mode" parameter.
And if band is specified the function needs to find the
correct "phy cap" in mac_phy_cap list.
The "supported_bands" can be a bit mask of
(WLAN_2G_CAPABILITY | WLAN_5G_CAPABILITY), use "&" to find
the phy cap of requested band.
Remove unused API wma_get_phyid_for_given_band.
Change-Id: I4b120d681b820e2a6e2b82f33d67fbcf6136af09
CRs-Fixed: 2571400