Change in flashrom[master]: VIA VL805 SPI Flash Bus support

[Neil Armstrong (Code Review)]

Attention is currently required from: Neil Armstrong, Carl-Daniel Hailfinger.
Hello build bot (Jenkins), Carl-Daniel Hailfinger,

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

https://review.coreboot.org/c/flashrom/+/50264

to look at the new patch set (#6).

Change subject: VIA VL805 SPI Flash Bus support
......................................................................

VIA VL805 SPI Flash Bus support

The VIA VL805 (and VL806 2-port variant) is a 4 ports PCIe
Super Speed USB 3.0 bridge.

Vendor website: https://www.via-labs.com/product_show.php?id=48

The bridge requires an SPI NOR Flash in order to load the firmware,
and provides undocumented registers to access this SPI bus in order
to program the SPI NOR Flash.

Reverse engineered based on PCI traces created by cleverca22 on a
Raspberry Pi 4 Model B.

Signed-off-by: Carl-Daniel Hailfinger 
[narmstrong: Tested, fixed validated on an Amlogic ARM64 based board with the VL806 variant]
Signed-off-by: Neil Armstrong 
Change-Id: I7439d31cdf5a2174dd27b9dbe5de24ad64963334
---
M Makefile
M flashrom.8.tmpl
M flashrom.c
M meson.build
M meson_options.txt
M programmer.h
A vl805.c
7 files changed, 209 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/64/50264/6