KVM: x86: Move guts of kvm_arch_init() to standalone helper

KVM: x86: Move guts of kvm_arch_init() to standalone helper

[ Upstream commit 4ae20875c9bf11136fc74c56a449a24ff47add1c ]

Move the guts of kvm_arch_init() to a new helper, kvm_x86_vendor_init(),
so that VMX can do _all_ arch and vendor initialization before calling
kvm_init().  Calling kvm_init() must be the _very_ last step during init,
as kvm_init() exposes /dev/kvm to userspace, i.e. allows creating VMs.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221130230934.1014142-14-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Stable-dep-of: 3c3b35a745e3 ("KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace")
Signed-off-by: Sasha Levin <sashal@kernel.org>