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/southbridge/intel/common/spi.c

@@ -35,8 +35,6 @@
 
 #include <spi-generic.h>
 
-#define min(a, b) ((a)<(b)?(a):(b))
-
 #define HSFC_FCYCLE_OFF		1	/* 1-2: FLASH Cycle */
 #define HSFC_FCYCLE		(0x3 << HSFC_FCYCLE_OFF)
 #define HSFC_FDBC_OFF		8	/* 8-13: Flash Data Byte Count */