src: Remove unuse '<timestamp.h>

Change-Id: I4fa03c4576bb0256b73f1d36ca840e120b750a74
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44099
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/drivers/amd/agesa/bootblock.c

@@ -2,7 +2,6 @@
 
 #include <bootblock_common.h>
 #include <halt.h>
-#include <timestamp.h>
 #include <amdblocks/amd_pci_mmconf.h>
 #include <amdblocks/biosram.h>
 #include <arch/bootblock.h>