x86/boot/e820: Remove unnecessary __ASSEMBLY__ guard

asm/e820/api.h had a spurious __ASSEMBLY__ guard - but the
API header is not included in any assembly files. Remove it.

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/include/asm/e820/api.h

@@ -3,7 +3,6 @@
 
 #include <asm/e820/types.h>
 
-#ifndef __ASSEMBLY__
 /* see comment in arch/x86/kernel/e820.c */
 extern struct e820map *e820;
 extern struct e820map *e820_saved;
@@ -47,7 +46,6 @@ static inline bool is_ISA_range(u64 start, u64 end)
 	return start >= ISA_START_ADDRESS && end <= ISA_END_ADDRESS;
 }
 
-#endif /* __ASSEMBLY__ */
 #include <linux/ioport.h>
 
 #define HIGH_MEMORY	(1024*1024)