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

[Damien Zammit (Code Review)]

Attention is currently required from: Martin L Roth.

Damien Zammit has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/71609 )

Change subject: WIP: mb/hp/t620: Add new board HP T620
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Patch Set 1:

(1 comment)

Patchset:

PS1: 
This is the board commit, last in patch series of bringing back fam16kb.

I'm not sure why the MP initialization failed. log says:

```
[INFO ]  CPU: AMD GX-217GA SOC with Radeon(tm) HD Graphics   .
[INFO ]  LAPIC 0x0 in XAPIC mode.
[DEBUG]  CPU: APIC: 00 enabled
[DEBUG]  CPU: APIC: 01 enabled
[DEBUG]  Loading module at 0x00030000 with entry 0x00030000. filesize: 0x178 memsize: 0x178
[DEBUG]  Processing 16 relocs. Offset value of 0x00030000
[DEBUG]  Attempting to start 1 APs
[DEBUG]  Waiting for 10ms after sending INIT.
[DEBUG]  Waiting for SIPI to complete...
[DEBUG]  done.
[DEBUG]  Waiting for SIPI to complete...
[DEBUG]  done.
[ERROR]  Not all APs checked in: -1/1.
[DEBUG]  -1/1 eventually checked in?
[ERROR]  MP initialization failure.
[DEBUG]  CPU_CLUSTER: 0 init finished in 1523 msecs
...
```