KVM: selftests: Test gp event filters don't affect fixed event filters

Add a test to ensure that setting both generic and fixed performance
event filters does not affect the consistency of the fixed event filter
behavior in KVM.

Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
Link: https://lore.kernel.org/r/20230810090945.16053-7-cloudliang@tencent.com


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