qcacmn: Add target_if changes for dynamic hw-mode config

This feature enables a user to change HW mode dynamically
from DBS to DBS_SBS mode and vice-versa. Currently, HW
mode configuration is only possible through INI setting
requiring a subsequent reboot.

Primary target_if changes are:

1. Add structure definition wlan_psoc_host_hal_reg_cap_ext
to parse and store the new extended regulatory capability
info in WMI_MAC_PHY_CAPABILITIES tlv sent in EXT service
ready WMI event
2. Add API target_psoc_get_num_radios_for_mode to retrieve
the number of radios corresponding to a hw-mode
3. Add API target_psoc_get_mac_phy_cap_for_mode to retrieve
the pointer to the mac_phy_cap info of the first radio
corresponding to the input hw-mode.

Change-Id: Ia10f0fd5e50c0ce0cbe99f9281147266aedce4e9
CRs-fixed: 2490212
8 files changed