acpi: Use bus_generic_alloc_resource instead of duplicating it

[imp]

This is the sort of commit that needs a one to three line 'why?' because I can guarantee in a year or five when someone looks at this they will ask themselves that.

[jhb]

In D43686#998982, @imp wrote:

This is the sort of commit that needs a one to three line 'why?' because I can guarantee in a year or five when someone looks at this they will ask themselves that.

Hah, ok. I can add something like "No functional change, but it is cleaner to use the existing generic wrappers rather than KOBJ methods directly."

[imp]

In D43686#999008, @jhb wrote:

In D43686#998982, @imp wrote:

This is the sort of commit that needs a one to three line 'why?' because I can guarantee in a year or five when someone looks at this they will ask themselves that.

Hah, ok. I can add something like "No functional change, but it is cleaner to use the existing generic wrappers rather than KOBJ methods directly."

Perfect. It's such a basic change in some ways, so it's hard to know if it's a cleanliness thing, or some subtle difference between wrappers and KOBJ_SHOUTING_VERSIONS.