qcacmn: Add vendor attribute to set/get wifi configuration

Add vendor attribute for data used by
VENDOR_SUBCMD_SET_WIFI_CONFIGURATION and
VENDOR_SUBCMD_GET_WIFI_CONFIGURATION subcommands.

Change-Id: If64da28c040868d5b42af202c647251db1a684c0
CRs-Fixed: 2137081
1 file changed