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/drivers/ati/ragexl/atyfb.h

@@ -6,8 +6,6 @@
 
 #define EINVAL -1
 
-#define max(x,y) (x>=y)?x:y
-
 #if CONFIG_CONSOLE_BTEXT
     /*
      *  Elements of the hardware specific atyfb_par structure

src/drivers/pc80/tpm.c

@@ -50,8 +50,6 @@
 	TPM_DEBUG("Write reg 0x%x with 0x%x\n", (reg_), (val_))
 #define printf(x...) printk(BIOS_ERR, x)
 
-#define min(a,b) MIN(a,b)
-#define max(a,b) MAX(a,b)
 #define readb(_a) (*(volatile unsigned char *) (_a))
 #define writeb(_v, _a) (*(volatile unsigned char *) (_a) = (_v))
 #define readl(_a) (*(volatile unsigned long *) (_a))