perf/x86/cstate: Add Tremont support

Tremont is Intel's successor to Goldmont Plus. From the perspective of
Intel cstate residency counters, there is nothing changed compared with
Goldmont Plus and Goldmont.

Share glm_cstates with Goldmont Plus and Goldmont.
Update the comments for Tremont.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/1580236279-35492-2-git-send-email-kan.liang@linux.intel.com