KVM: selftests: Add CR8 reserved-bit checks to set_sregs_test

Extend set_sregs_test to cover CR8. Verify that the architecturally
allowed bits [3:0] can be set and read back, that every reserved bit
[63:4] is rejected by KVM_SET_SREGS, and that a successful set is
observable via KVM_GET_SREGS.

Without the accompanying fix to kvm_is_valid_sregs(), setting a reserved
CR8 bit is silently accepted and the read-back value diverges from the
value written, so this test fails on an unpatched kernel and passes once
the fix is applied.

Signed-off-by: Tharit Tangkijwanichakul <tharitt97@gmail.com>
Link: https://patch.msgid.link/20260908160426.6547-3-tharitt97@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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