KVM: x86: Rename kvm_{g,s}et_msr()* to show that they emulate guest accesses

KVM: x86: Rename kvm_{g,s}et_msr()* to show that they emulate guest accesses

Rename
	kvm_{g,s}et_msr_with_filter()
	kvm_{g,s}et_msr()
to
	kvm_emulate_msr_{read,write}
	__kvm_emulate_msr_{read,write}

to make it more obvious that KVM uses these helpers to emulate guest
behaviors, i.e., host_initiated == false in these helpers.

Suggested-by: Sean Christopherson <seanjc@google.com>
Suggested-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Tested-by: Mathias Krause <minipli@grsecurity.net>
Tested-by: John Allen <john.allen@amd.com>
Signed-off-by: Chao Gao <chao.gao@intel.com>
Tested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Link: https://lore.kernel.org/r/20250812025606.74625-2-chao.gao@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>