src/soc/amd: 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: Iefb37d28c7f13563fa652cd6b2f661f462a3a32e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/common/block/apob/apob_cache.c

@@ -8,7 +8,6 @@
 #include <commonlib/helpers.h>
 #include <commonlib/region.h>
 #include <console/console.h>
-#include <delay.h>
 #include <fmap.h>
 #include <spi_flash.h>
 #include <stdint.h>