Change in coreboot[master]: nb/intel/sandybridge: Add support for DPR

[Michał Żygowski (Code Review)]

Attention is currently required from: Michał Żygowski.
Hello build bot (Jenkins), Paul Menzel, Angel Pons, Patrick Rudolph,

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

https://review.coreboot.org/c/coreboot/+/59512

to look at the new patch set (#3).

Change subject: nb/intel/sandybridge: Add support for DPR
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nb/intel/sandybridge: Add support for DPR

Include DPR in the memory map calculations if enabled. DPR is required
for Intel TXT support.

TEST=Boot Debian 10 and see the DPR memory being reserved in E820 and
cbmem logs:
"BIOS-e820: [mem 0x000000007fc09000-0x00000000829fffff] reserved"
"TSEG base 0x80000000 size 8M"
"DPR base 0x7fd00000 size 3M"

Signed-off-by: Michał Żygowski 
Change-Id: Ia22e49ba58709acfa0afe0921aa71d83cc06c129
---
M src/northbridge/intel/sandybridge/memmap.c
M src/northbridge/intel/sandybridge/northbridge.c
2 files changed, 43 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/12/59512/3