qcacmn: Fix channel_map NULL

Initialize channel_map to "us" at regulatory init.
Use NUM_6GHZ_CHANNELS to get 6Ghz channel numbers
instead of MAX_6GHZ_CHANNEL.

Change-Id: Ifed996c1a528c8a3c0a29d3959f17dff6d298193
CRs-Fixed: 2949971
2 files changed