Change in coreboot[master]: acpi/device: Add ability to generate proper _STA for PowerResource

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Lance Zhao, Raul Rangel, Furquan Shaikh.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55027 )

Change subject: acpi/device: Add ability to generate proper _STA for PowerResource
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Patch Set 1:

(1 comment)

File src/acpi/device.c:

https://review.coreboot.org/c/coreboot/+/55027/comment/3485efe8_f881caa1 
PS1, Line 605: acpigen_write_method
If you're going to go with reading GPIOs, this needs to be Serialized, so it won't run with _ON or _OFF or be reentrant.

Honestly though, my thought for this was always to have a Name in the PowerResource that stores the state, like so:

```
PowerResource (FOO)
{
    Name (STA, 0) // or maybe some way to set the default state if it's already ON
    Method (_ON) { 
        ... // GPIOs
        STA = 1
    }
    Method (_OFF) {
        .. // GPIOs
        STA = 0
    }
    Method (_STA) {
        Return (STA)
    }
}
```

WDYT? It's a little simpler (and faster too)