luci-mod-network: add autoneg and duplex options

[sion-111]

• This PR is not from my main or master branch, but a separate branch
• Each commit has a valid Signed-off-by: sion-111 <s.piotrowski91@gmail.com>
• Each commit and PR title has a valid <package name>: title first line subject
• Incremented any PKG_VERSION in the Makefile (not applicable)
• Tested on: Banana Pi BPI-R4, OpenWrt 23.05.x, LuCI (browser: Chromium)
• Mention the original code author for feedback
• Screenshot or mp4 of changes
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Description

This change adds Auto negotiation and Duplex options to device settings
in LuCI network configuration.

Leaving the value empty keeps the default kernel behavior.

Tested on Banana Pi BPI-R4.

[feckert]

The documentation sayes that this is a string. However, the option is actually a Boolean and therefore a flag in Luci.
If the option is not set, 1 is assumed, and should not be saved in the configuration. As this is the standard for autneg and duplex nowadays.

[systemcrash]

For devs not familiar with the luci formats, this is a viable way of handling a boolean, but it's much more 'clicking' than just a Flag. Flag is preferred 👍

[github-actions]

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