[M] Change in coreboot[main]: drivers/amd/opensil/romstage.c: Implement cbmem_top_chipset in driver

[Nick Kochlowski (Code Review)]

Attention is currently required from: Martin Roth, Nick Kochlowski.

Hello Felix Held, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/85635?usp=email

to look at the new patch set (#13).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: drivers/amd/opensil/romstage.c: Implement cbmem_top_chipset in driver
......................................................................

drivers/amd/opensil/romstage.c: Implement cbmem_top_chipset in driver

Define the generic cbmem_top_chipset() in the driver code, which will
invoke a SoC-specific vendorcode openSIL call to retrieve the low
usable DRAM address.

Change-Id: Ibc79456b0429cdd3d8e3fa5c224799a05add8359
Signed-off-by: Nicolas Kochlowski 
---
M src/drivers/amd/opensil/Makefile.mk
A src/drivers/amd/opensil/romstage.c
M src/vendorcode/amd/opensil/genoa_poc/romstage.c
M src/vendorcode/amd/opensil/opensil.h
M src/vendorcode/amd/opensil/stub/romstage.c
5 files changed, 38 insertions(+), 24 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/35/85635/13