perf, x86: P4 PMU - clean up the code a bit

No change on the functional level, just align the table properly.
Signed-off-by: NCyrill Gorcunov <gorcunov@openvz.org>
Cc: Lin Ming <ming.m.lin@intel.com>
LKML-Reference: <4D8FA213.5050108@openvz.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>