[i386] add AMD Barcelona PMU MSR definitions

AK: Not used right now, but will presumably at some point.

[ tglx: arch/x86 adaptation ]
Signed-off-by: NStephane Eranian <eranian@hpl.hp.com>
Signed-off-by: NRobert Richter <robert.richter@amd.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>