stdlib: Drop duplicates of min() and max()

Change-Id: Ib2f6fad735e085d237a0d46e0586e123eef6e0e2
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6161
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/include/stdlib.h

@@ -13,6 +13,9 @@
 #define MIN(a,b) ((a) < (b) ? (a) : (b))
 #define MAX(a,b) ((a) > (b) ? (a) : (b))
 
+#define min(a,b) MIN((a),(b))
+#define max(a,b) MAX((a),(b))
+
 #if !defined(__PRE_RAM__)
 void *memalign(size_t boundary, size_t size);
 void *malloc(size_t size);