LinuxKPI: add linux/leds.h

This is just a dummy enum and struct in order to make drivers compile
more happily as some parts are simply not hidden behind #ifdefs and
this avoids a longer-term mainten

LinuxKPI: add linux/leds.h

This is just a dummy enum and struct in order to make drivers compile
more happily as some parts are simply not hidden behind #ifdefs and
this avoids a longer-term maintenance problem.

MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D37215

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