hotspot: when creating a hotspot,the channel should be random to avoid co-channel interference

When the current network-manager creates a 2.4G hotspot, the channel is always 1
Log: wpa_supplicant[824]: Mode: IEEE 802.11g  Channel: 1  Frequency: 2412 MHz
54 jobs for random_channel in 48 minutes and 28 seconds (queued for 28 seconds)
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