Add support for ROG MAXIMUS Z690 EXTREME GLACIAL

[Svek]

This adds support for the ROG MAXIMUS Z690 EXTREME GLACIAL, as this motherboard comes out of the box with a monoblock the ASUS EC has additional readings/values that are unique for this motherboard, in particular:

• built-in water flow sensor (inside the monoblock)
• built-in water temperature (inside the monoblock)
• optional temperature sensor (header on the motherboard) for water in
• optional temperature sensor (header on the motherboard) for water out
• optional water flow sensor (header on the motherboard)

I had to add an additional enum type called TempWaterBlockIn --- which is probably unlikely going to ever be found useful for most motherboards, but there are a few rare ones out there that come with this sensor.

Otherwise, the rest of the code conforms to the rest of the code-base.

[PhyxionNL]

Thanks @Svek 🎉

[zeule]

Hey, @Svek! Could you, please, share DSDT for this board (preferably at https://github.com/zeule/asus-ec-sensors) to add it to the Linux HWMON driver?

[Svek]

@zeule I followed the readme on your site as noted, back when I started working on this.

Method (BREC, 1, Serialized)
{
   Return (Ones)
   Return (Ones)
}

This didn't look promising, so I didn't continue further. Is there something else I can do?

[zeule]

Yes, please share the DSDT content so I can find what ACPI mutex is used (if any) by the firmware to guard access to EC and SIO.

[zeule]

… so I can find what ACPI mutex is used (if any) by the firmware to guard access to EC and SIO.

And keep it for possible future refactoring.