memblock: Remove #ifdef __KERNEL__ from memblock.h

memblock.h is not a uAPI header, so __KERNEL__ guard can be deleted
Signed-off-by: Karolina Drobnik <karolinadrobnik@gmail.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/20220111102847.673746-1-karolinadrobnik@gmail.com

include/linux/memblock.h

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 #ifndef _LINUX_MEMBLOCK_H
 #define _LINUX_MEMBLOCK_H
-#ifdef __KERNEL__
 
 /*
  * Logical memory blocks.
@@ -605,6 +604,5 @@ static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 }
 #endif
 
-#endif /* __KERNEL__ */
 
 #endif /* _LINUX_MEMBLOCK_H */