platform/x86: fujitsu-laptop: simplify platform device attribute definitions

Use the DEVICE_ATTR_RO() macro to get rid of ignore_store() and shorten
attribute definitions.  Adjust whitespace to make checkpatch happy.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Tested-by: Jonathan Woithe <jwoithe@just42.net>
Reviewed-by: Jonathan Woithe <jwoithe@just42.net>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>