qcacld-3.0: Find 6 GHz power type for connection channel

Currently host doesn't check if power type is supported
for connection channel while calculating best 6 GHz
power type for connection. This results in calculation
of incorrect power for connection values if 6 GHz power
type is not supported for that particular channel.

To address this issue configure power type for connection
only if that power type is supported for connection
channel.

Change-Id: I7e4ccdb962974cc8c415e8d174b2da0bf311f1a5
CRs-Fixed: 3697212