perf: Support Xeon E7's via the Westmere PMU driver

There's a new model number public, 47, for Xeon E7 (aka Westmere EX).

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: a.p.zijlstra@chello.nl
Link: http://lkml.kernel.org/r/1303429715-10202-1-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>