x86/boot/e820: Remove unnecessary #include's

A number of headers were included into e820.c unnecessarily - remove them.

No change in functionality.

Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/e820.c

@@ -8,13 +8,8 @@
  * quirks and other tweaks, and feeds that into the generic Linux memory
  * allocation code routines via a platform independent interface (memblock, etc.).
  */
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/init.h>
 #include <linux/crash_dump.h>
-#include <linux/export.h>
 #include <linux/bootmem.h>
-#include <linux/pfn.h>
 #include <linux/suspend.h>
 #include <linux/acpi.h>
 #include <linux/firmware-map.h>
@@ -22,9 +17,7 @@
 #include <linux/sort.h>
 
 #include <asm/e820/api.h>
-#include <asm/proto.h>
 #include <asm/setup.h>
-#include <asm/cpufeature.h>
 
 /*
  * We organize the E820 table into two main data structures: