[AML] Be rid of damned cpu type magic numbers
[AML] Don't assume M1 for unknown CPUs
[AML] Apply MX cpu scale hack only to MX
[AML] Use M1 digital_raw val only on M1
[AML] Ensure cputype range checks are valid.
[AML] Cosmetics

1) Sort device checks
2) Rename *cputype symbols to *device_type for consistency