backports: Add DEFINE_SHOW_ATTRIBUTE macro

This was introduced in Linux commit a08f06bb7a07 ("seq_file: Introduce
DEFINE_SHOW_ATTRIBUTE() helper macro" and is used by the cw1200 and the
wil6210 driver.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
1 file changed