xen/x86: import intel-family.h from Linux

xen/x86: import intel-family.h from Linux

Last commit to the file is:

7d697f0d5737 x86/cpu: Drop spurious underscore from RAPTOR_LAKE #define

This should help the readability of code that's currently open-coding
Intel model numbers.

No change introduced to existing code, it's expected that new code
could start using the defines. Changing existing users could cause
quite a lot of code churn.

Requested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>