KVM: x86/mmu: Convert MMU walker's bounds check from BUG_ON() to KVM_BUG_ON()

Bug the VM, not the host, if KVM's sanity check that walking guest PTEs
doesn't underflow the walker's level fires.  Bugging the host while holding
mmu_lock is all but guaranteed to panic the host, KVM hasn't _yet_ consumed
the out-of-bounds level (i.e. hasn't corrupted memory), and KVM is already
committed to bugging the VM and synthesizing a guest page fault if a fatal
MMU error occurs while walking guest PTEs.  I.e. there's no reason to keep
the BUG_ON() at this point.

Link: https://patch.msgid.link/20260902232028.2767071-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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