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Assert that the number of known fixed_pmc_events matches the max number of
fixed counters supported by KVM, and clean up related code.

Opportunistically extend setup_fixed_pmc_eventsel()'s use of
array_index_nospec() to cover fixed_counters, as nr_arch_fixed_counters is
set based on userspace input (but capped using KVM-controlled values).

Link: https://lore.kernel.org/r/20230607010206.1425277-4-seanjc@google.com

Signed-off-by: Sean Christopherson <seanjc@google.com>