lib/lcm.c: replace include

We don't need all the stuff kernel.h pulls in; just compiler.h since
export.h doesn't do necessary #includes.  This removes more than 100
dependencies.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>