x86/pmu: Add gp_events pointer to route different event tables

AMD and Intel do not share the same set of coding rules for performance
events, and code to test the same performance event can be reused by
pointing to a different coding table, noting that the table size also
needs to be updated.

Signed-off-by: Like Xu <likexu@tencent.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221102225110.3023543-25-seanjc@google.com