extmod/network_cyw43: Fix handling of networks with open security.

Prior to this commit, the default security=-1 would be passed directly
through to the cyw43 driver to auto-detect the security type, but that
driver did not correctly handle the case of open security.

The cyw43 driver has now been changed to no longer support auto-detection,
rather it is up to the caller to always select the security type.  The
defaults are now implemented in the Python bindings and are:
- if no key is given then it selects open security
- if a key is given then it selects WPA2_MIXED_PSK

Calling `wlan.connect(<ssid>)` will now connect to an open network, on
both rp2 and stm32 ports.  The form `wlan.connect(<ssid>, <key>)` will
connect to a WPA2 network.

Fixes issue #9016.

Signed-off-by: Damien George <damien@micropython.org>

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