Change in coreboot[master]: mb/hp/t620: Add new board HP T620

[Paul Menzel (Code Review)]

Attention is currently required from: Martin Roth, Damien Zammit.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63520 )

Change subject: mb/hp/t620: Add new board HP T620
......................................................................

Patch Set 2:

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/63520/comment/dd49578d_cbedc6c2 
PS2, Line 9: This is the diff applied to the previous commit to change
           : the biostar/a68n_5200 port into support for new board:
           : HP T620 thin client.
           : 
           : This work was done during a coreboot hacking party!
           : Board is AMD Fam16kb with laptop ram.
           : 
           : coreboot console works over serial COMA by default.
           : Board is fanless, so no need for fan control.
Please reflow for 72 characters per line.

https://review.coreboot.org/c/coreboot/+/63520/comment/e16bb9db_4eb34b64 
PS2, Line 19: SeaBIOS
Which version?

https://review.coreboot.org/c/coreboot/+/63520/comment/d9ecaff4_55cdfe10 
PS2, Line 19: debian
What version of the Linux kernel?

https://review.coreboot.org/c/coreboot/+/63520/comment/92e3602d_aba1097b 
PS2, Line 23:  - PIRQs could be wrong (copied from other board)
You can look at I23ab33ec6a43ac61fc37109ddeca920afb07498d (asus/am1i-a: fix the IRQs and create the good MP tables) [1] for ideas how to fix this.

[1]: https://review.coreboot.org/c/coreboot/+/58754/