coreinfo: Add support to read timestamps

Read timestamps from the last boot sequence and display the information
as if using cbmem -t.

Tested on QEMU with a SeaBIOS payload.

Change-Id: I44f1f6d6e4ef5458aca555c8a7d32cc8aae46502
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/15600
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
4 files changed