x86/mwait_idle: remove assumption of one C-state per MWAIT flag

x86/mwait_idle: remove assumption of one C-state per MWAIT flag

Remove the assumption that cstate_tables are indexed by MWAIT flag
values. Each entry identifies itself via its own flags value. This
change is needed to support multiple states that share the same MWAIT
flags.

Note that this can have an effect on what state is described by 'N' on
cmdline max_cstate=N on some systems.

Signed-off-by: Len Brown <len.brown@intel.com>
Avoided the effect of changing the meaning of "max_cstate=".
Drop MWAIT_MAX_NUM_CSTATES (done differently in a prior patch on
Linux).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>