treewide: remove duplicate includes

Many stupid corrections of duplicated includes based on the output of
scripts/checkincludes.pl.

Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

arch/powerpc/platforms/pseries/smp.c

@@ -44,7 +44,6 @@
 #include <asm/mpic.h>
 #include <asm/vdso_datapage.h>
 #include <asm/cputhreads.h>
-#include <asm/mpic.h>
 #include <asm/xics.h>
 
 #include "plpar_wrappers.h"