platform-drivers-x86 for v4.16-2

DEFINE_SHOW_ATTRIBUTE() macro defined privately in 3 locations is
useful for new and old users to avoid a lot of code duplication.

Move the macro to seq_file.h.

Along with above, clean up 3 drivers to use that macro.

The following is an automated git shortlog grouped by driver:

dell-laptop:
 -  Re-use DEFINE_SHOW_ATTRIBUTE() macro

ideapad-laptop:
 -  Re-use DEFINE_SHOW_ATTRIBUTE() macro

samsung-laptop:
 -  Re-use DEFINE_SHOW_ATTRIBUTE() macro

seq_file:
 -  Introduce DEFINE_SHOW_ATTRIBUTE() helper macro
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