soc/amd/common: Add code to print AMD STB to boot log

This allows platforms that support AMD's STB (Smart Trace Buffer) to
print the buffer at various points in the boot process.

The STB is roughly a hardware assisted postcode that captures the
time stamp of when the postcode was added to the buffer.  Reading
from the STB clears the data.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I8d78c0e86b244f3bd16248edf3850447fb0a9e2c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

0 files changed, 0 insertions, 0 deletions