bluetooth: host: name AUTO_PHY choices

[JordanYates]

Add names to the automatic PHY update choices so the defaults can be updated.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[jhedberg]

Seems fine to me, but I'd be curious to hear how you prefer to change the defaults and why? The current values are simply to retain as close behavior as possible to what we had before, with the exception that as peripheral you have to explicitly enable the AUTO_PHY_UPDATE option to get this.

[JordanYates]

Seems fine to me, but I'd be curious to hear how you prefer to change the defaults and why? The current values are simply to retain as close behavior as possible to what we had before, with the exception that as peripheral you have to explicitly enable the AUTO_PHY_UPDATE option to get this.

The defaults might be same (since AUTO_PHY_UPDATE previously defaulted to y), but right now there is no Kconfig default way to stop any PHY updates from happening (you can't set defaults on choice options, just the choice itself).

zephyr/subsys/bluetooth/host/Kconfig

Lines 449 to 452 in 8aaa503

	choice
	prompt "Auto PHY update for central role"
	depends on BT_CENTRAL
	default BT_AUTO_PHY_CENTRAL_2M

[kartben]

It is worth adding the "new" symbols to the release notes please