qcacmn: set pdev id to 0xFF when set country code

From firmware perspective, host only sets 5 GHz regdomain hence 2 GHz
uses default setting and firmware does not update channel list event
for all phys according to the new country code.
Therefore sets pdev_id to 0xFF in function reg_set_country and it is
mapping to WMI_PDEV_ID_SOC when issue wmi command
WMI_SET_CURRENT_COUNTRY_CMDID as firmware required.

Change-Id: I0eb84db9f6d77c0473161cc4ffc0dcebd31c3d45
CRs-Fixed: 3239644