KVM: selftests: Add testing for KVM_SET_PMU_EVENT_FILTER

Test that masked events are not using invalid bits, and if they are,
ensure the pmu event filter is not accepted by KVM_SET_PMU_EVENT_FILTER.
The only valid bits that can be used for masked events are set when
using KVM_PMU_ENCODE_MASKED_ENTRY() with one exception: If any of the
high bits (35:32) of the event select are set when using Intel, the pmu
event filter will fail.

Also, because validation was not being done prior to the introduction
of masked events, only expect validation to fail when masked events
are used.  E.g. in the first test a filter event with all its bits set
is accepted by KVM_SET_PMU_EVENT_FILTER when flags = 0.

Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Link: https://lore.kernel.org/r/20221220161236.555143-7-aaronlewis@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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