mb/dell: OptiPlex 3050 Micro port (Intel KabyLake)

mb/dell: OptiPlex 3050 Micro port (Intel KabyLake)

- Boots Linux 6.11 (Debian)
- GRUB and SeaBIOS payloads work
- SMSC SCH5553 SIO/EC
  + Serial port works
  + PWM fan control works
- Realtek Gigabit LAN works
- WiFi slot works
- NVMe SSD slot works
- Extra: LPSS UART0
  + Stock FW sets undocumented power gating bit, RTC battery needs to
    be pulled for it to work.
  + Signals exposed on test points on the back of the board.
    FIXME: add documentation about this
- Needs 'deguard' to bypass BootGuard
  + See https://review.coreboot.org/admin/repos/deguard,general
- Audio works
- All USB ports work
- Currently limited to the Micro form factor, but others are very
  similar
- HDA verbs and VBT by Leah Rowe

Change-Id: I8d443e39ee684a4eaa19c835a945cfe569c051e2
Signed-off-by: Mate Kukri <kukri.mate@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82053
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>