Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code. No functional change. Signed-off-by: Longlong Xia <xialonglong@kylinos.cn> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240819095816.447096-1-xialonglong@kylinos.cn