acpi_spmc(4): Constraints: Rename the Intel-format parser

[olce]

Summary

...from acpi_spmc_get_constraints_spec() to
acpi_spmc_get_constraints_intel(), as really there is no ACPI
specification proper and parsing the constraints is done according to
some *Intel* specification (even if it is true that, by contrast, AMD
has none).

No functional change (intended).

[obiwac]

good, I was not happy about how I named this :)