Wifi-phy RF neighbors RSSI does not indicate that it is negative number representation

[jsnyder81]

The description of RSSI in the wifi-phy neighbor-list-state grouping does not include the same language as other leafs. Specifically that RSSI should be represented as a negative number.

neighbor-list-state RSSI:
https://github.com/openconfig/public/blob/master/release/models/wifi/openconfig-wifi-phy.yang#L387

Example: client-rf-state
https://github.com/openconfig/public/blob/master/release/models/wifi/openconfig-wifi-mac.yang#L1334

I will be submitting a PR for this change.

[github-actions]

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