perf/x86/intel/uncore: Add Intel Icelake uncore support

Add Intel Icelake uncore support:

 - The init code is based on Skylake
 - Add new PCI id for IMC
 - New MSR address for CBOX
 - Get CBOX# from CNL_UNC_CBO_CONFIG MSR directly
 - Create a new PMU for fixed clocktick counter

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: acme@kernel.org
Cc: jolsa@kernel.org
Link: https://lkml.kernel.org/r/20190402194509.2832-13-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>