KVM: VMX: Synthesize nested EPT violation GVA_IS_VALID/GVA_TRANSLATED bits

When injecting an EPT Violation into L2 in response to a fault detected
while emulating an L2 GVA access, synthesize the GVA_IS_VALID and
GVA_TRANSLATED bits using information provided by the walker, instead of
pulling the bits from vmcs02.EXIT_QUALIFICATION.  The information in
vmcs02.EXIT_QUALIFICATION is valid/correct if and only if the fault being
injected into L1 is the direct result of an EPT Violation VM-Exit from L2.

E.g. if KVM is emulating an I/O instruction and the memory operand's
translation through L1's EPT fails, using vmcs02.EXIT_QUALIFICATION is
wrong as the semantics for EXIT_QUALIFICATION would be for an I/O exit,
not an EPT Violation exit.

Opportunistically clean up the formatting for creating the mask of bits
to pull from vmcs02.EXIT_QUALIFICATION.

Signed-off-by: Kevin Cheng <chengkev@google.com>
[sean: use plumbed in @access bits, massage changelog]
Link: https://patch.msgid.link/20260522232701.3671446-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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