src/drivers: Remove unused <delay.h>

Found using:
diff <(git grep -l '#include <delay.h>' -- src/) <(git grep -l 'get_timer_fsb(\|init_timer(\|udelay(\|mdelay(\|delay(' -- src/) |grep "<"

Change-Id: Ifda7b3a798c8b1736e125b2527f95e697951d7bd
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60608
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/drivers/aspeed/common/ast_main.c

@@ -3,7 +3,6 @@
  * Authors: Dave Airlie <airlied@redhat.com>
  */
 
-#include <delay.h>
 #include <device/pci_def.h>
 
 #include "ast_drv.h"

src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <console/console.h>
-#include <delay.h>
 #include <endian.h>
 #include <device/i2c_simple.h>
 #include <dp_aux.h>