timestamp: Drop duplicate TS_END_ROMSTAGE entries

This entry gets added in run_ramstage().

Change-Id: I18cda4ead3614c6d07c3269cbee53e6def6408c7
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15755
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/southbridge/intel/fsp_i89xx/romstage.c

@@ -212,8 +212,6 @@ void romstage_main_continue(EFI_STATUS status, VOID *HobListPtr) {
 	*(uint32_t*)cbmem_hob_ptr = (uint32_t)HobListPtr;
 	post_code(0x4f);
 
-	timestamp_add_now(TS_END_ROMSTAGE);
-
 	run_ramstage();
 }