kernel.h: unconditionally include asm/div64.h for do_div()

Include asm/div64.h for do_div() usage in DIV_ROUND_DOWN_ULL() and
DIV_ROUND_CLOSEST_ULL().  Remove the old CONFIG_LBDAF=y conditional
include.

Link: http://lkml.kernel.org/r/20181228153430.23763-1-jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/kernel.h

@@ -14,6 +14,7 @@
 #include <linux/printk.h>
 #include <linux/build_bug.h>
 #include <asm/byteorder.h>
+#include <asm/div64.h>
 #include <uapi/linux/kernel.h>
 
 #define USHRT_MAX	((u16)(~0U))
@@ -204,7 +205,6 @@
 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
 
 #ifdef CONFIG_LBDAF
-# include <asm/div64.h>
 # define sector_div(a, b) do_div(a, b)
 #else
 # define sector_div(n, b)( \