include/common.h: remove DIV_ROUND definition

All the references of DIV_ROUND have been replaced with
DIV_ROUND_CLOSEST.  Remove DIV_ROUND.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

include/common.h

@@ -950,7 +950,6 @@ static inline phys_addr_t map_to_sysmem(const void *ptr)
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
 #define ROUND(a,b)		(((a) + (b) - 1) & ~((b) - 1))
-#define DIV_ROUND(n,d)		(((n) + ((d)/2)) / (d))
 #define DIV_ROUND_UP(n,d)	(((n) + (d) - 1) / (d))
 #define roundup(x, y)		((((x) + ((y) - 1)) / (y)) * (y))