Change in flashrom[master]: ichspi: Add Alder Lake support

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Nico Huber, Rizwan Qureshi, Edward O'Callaghan, Angel Pons.
Hello Sam McNally, build bot (Jenkins), Nico Huber, Subrata Banik, Rizwan Qureshi, Angel Pons, EricR Lai,

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

https://review.coreboot.org/c/flashrom/+/62251

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

Change subject: ichspi: Add Alder Lake support
......................................................................

ichspi: Add Alder Lake support

Does exactly what it says on the tin.

BUG=b:220799648
TEST=```localhost ~ # flashrom --flash-name
<snip>
Found Programmer flash chip "Opaque flash chip" (32768 kB, Programmer-specific) mapped at physical address 0x0000000000000000.
vendor="Programmer" name="Opaque flash chip"

flashrom -p internal --ifd -i fd -i bios -r /tmp/filename.rom
flashrom unknown on Linux 5.15.22 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
coreboot table found at 0x768a7000.
Found chipset "Intel Alder Lake-N".
Enabling flash write... Warning: Setting BIOS Control at 0xdc from 0x8b to 0x89 failed.
New value is 0x8b.
SPI Configuration is locked down.
OK.
Found Winbond flash chip "W25Q256JV_M" (32768 kB, Programmer-specific) mapped at physical address 0x0000000000000000.
Error accessing W25Q256JV_M, 0x2000000 bytes at 0x00000000fe000000
/dev/mem mmap failed: Resource temporarily unavailable
Could not map flash chip W25Q256JV_M at 0x00000000fe000000.
Reading ich descriptor... done.
Using regions: "bios", "fd".
Error accessing W25Q256JV_M, 0x2000000 bytes at 0x00000000fe000000
/dev/mem mmap failed: Resource temporarily unavailable
Could not map flash chip W25Q256JV_M at 0x00000000fe000000.
Reading flash... done.
SUCCESS

Also,
Reading ich descriptor... Reading 4096 bytes starting at 0x000000.
done.
Assuming chipset '600 series Alder Point'.
Added layout entry 00000000 - 00000fff named fd
Added layout entry 00500000 - 01ffffff named bios
Added layout entry 00001000 - 004fffff named me
```
Tested on Nivviks/ADL-N and Brya/ADL-P.

Change-Id: Ie66cf519df13f3391c41f5016b16a81ef3dfd4bf
Signed-off-by: Edward O'Callaghan 
---
M chipset_enable.c
M ich_descriptors.c
M ichspi.c
M programmer.h
M util/ich_descriptors_tool/ich_descriptors_tool.c
5 files changed, 34 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/51/62251/13