KVM: TDX: Return -EIO, not -EINVAL, on a KVM_BUG_ON() condition

Return -EIO when a KVM_BUG_ON() is tripped, as KVM's ABI is to return -EIO
when a VM has been killed due to a KVM bug, not -EINVAL.  Note, many (all?)
of the affected paths never propagate the error code to userspace, i.e.
this is about internal consistency more than anything else.

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251030200951.3402865-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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