UPSTREAM: seq_file: Introduce DEFINE_SHOW_ATTRIBUTE() helper macro

The DEFINE_SHOW_ATTRIBUTE() helper macro would be useful for current
users, which are many of them, and for new comers to decrease code
duplication.

Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Darren Hart (VMware) <dvhart@infradead.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Bug: 136497735
(cherry picked from commit a08f06bb)
Change-Id: Ib60cf57dc5e979915a83848919644150d82e7058
Signed-off-by: Hridya Valsaraju <hridya@google.com>