tree: Drop unused <timestamp.h>

Change-Id: Ic690a7543f8a1e072650917d7a1e9e3b9dc371a3
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81823
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Jakub Czapiga <czapiga@google.com>

src/soc/amd/common/vboot/transfer_buffer.c

@@ -7,7 +7,6 @@
 #include <psp_verstage/psp_transfer.h>
 #include <security/vboot/vbnv.h>
 #include <security/vboot/symbols.h>
-#include <timestamp.h>
 #include <2struct.h>
 
 DECLARE_REGION(cbmemc_transfer)

src/soc/intel/alderlake/romstage/romstage.c

@@ -23,7 +23,6 @@
 #include <soc/romstage.h>
 #include <soc/soc_chip.h>
 #include <cpu/intel/cpu_ids.h>
-#include <timestamp.h>
 #include <string.h>
 #include <security/intel/txt/txt.h>
 #include <soc/pcr_ids.h>

src/soc/intel/meteorlake/romstage/romstage.c

@@ -15,7 +15,6 @@
 #include <soc/pm.h>
 #include <soc/romstage.h>
 #include <soc/soc_chip.h>
-#include <timestamp.h>
 #include <string.h>
 
 #define FSP_SMBIOS_MEMORY_INFO_GUID	\