KVM: X86: Don't reset mmu context when toggling X86_CR4_PGE

KVM: X86: Don't reset mmu context when toggling X86_CR4_PGE

X86_CR4_PGE doesn't participate in kvm_mmu_role, so the mmu context
doesn't need to be reset.  It is only required to flush all the guest
tlb.

It is also inconsistent that X86_CR4_PGE is in KVM_MMU_CR4_ROLE_BITS
while kvm_mmu_role doesn't use X86_CR4_PGE.  So X86_CR4_PGE is also
removed from KVM_MMU_CR4_ROLE_BITS.

Signed-off-by: Lai Jiangshan <[email protected]>
Reviewed-by: Sean Christopherson <[email protected]>
Message-Id: <20210919024246[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>