lib: Add time stamp when starting to finalize chips

Add the new time stamps *finalize chips* to track, when the method
`dev_finalize_chips()` is called, so that the real time of
`write_tables()` is known.

Change-Id: I65ca0ec4c07c2eaa14982989cb206d23d8a2293f
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/17725
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/commonlib/include/commonlib/timestamp_serialized.h

@@ -56,6 +56,7 @@ enum timestamp_id {
 	TS_DEVICE_DONE = 70,
 	TS_CBMEM_POST = 75,
 	TS_WRITE_TABLES = 80,
+	TS_FINALIZE_CHIPS = 85,
 	TS_LOAD_PAYLOAD = 90,
 	TS_ACPI_WAKE_JUMP = 98,
 	TS_SELFBOOT_JUMP = 99,
@@ -141,6 +142,7 @@ static const struct timestamp_id_to_name {
 	{ TS_DEVICE_DONE,	"device setup done" },
 	{ TS_CBMEM_POST,	"cbmem post" },
 	{ TS_WRITE_TABLES,	"write tables" },
+	{ TS_FINALIZE_CHIPS,	"finalize chips" },
 	{ TS_LOAD_PAYLOAD,	"load payload" },
 	{ TS_ACPI_WAKE_JUMP,	"ACPI wake jump" },
 	{ TS_SELFBOOT_JUMP,	"selfboot jump" },

src/lib/hardwaremain.c

@@ -212,6 +212,7 @@ static boot_state_t bs_write_tables(void *arg)
 	 */
 	write_tables();
 
+	timestamp_add_now(TS_FINALIZE_CHIPS);
 	dev_finalize_chips();
 
 	return BS_PAYLOAD_LOAD;