KVM: x86: Harden is_64_bit_hypercall() against bugs on 32-bit kernels

Unconditionally return %false for is_64_bit_hypercall() on 32-bit kernels
to guard against incorrectly setting guest_state_protected, and because
in a (very) hypothetical world where 32-bit KVM supports protected guests,
assuming a hypercall was made in 64-bit mode is flat out wrong.

Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Link: https://patch.msgid.link/20260529222223.870923-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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