x86/nmi: Remove edac.h include leftover

... which

  db47d5f8 ("x86/nmi, EDAC: Get rid of DRAM error reporting thru PCI SERR NMI")

forgot to remove.

No functional changes.
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200515182246.3553-1-bp@alien8.de

arch/x86/kernel/nmi.c

@@ -25,10 +25,6 @@
 #include <linux/atomic.h>
 #include <linux/sched/clock.h>
 
-#if defined(CONFIG_EDAC)
-#include <linux/edac.h>
-#endif
-
 #include <asm/cpu_entry_area.h>
 #include <asm/traps.h>
 #include <asm/mach_traps.h>