KVM: selftests: Convert the Hyper-V feature test to printf style GUEST_ASSERT

Convert x86's Hyper-V feature test to use print-based guest asserts.
Opportunistically use the EQ and NE variants in a few places to capture
additional information.

Link: https://lore.kernel.org/r/20230729003643.1053367-23-seanjc@google.com


Signed-off-by: Sean Christopherson <seanjc@google.com>