gizmosphere/gizmo2: Changes to make it gizmo2

The preceding patch copied gizmo2 from the amd/olivehill
board. This commit includes the changes required to make
the code reflect the gizmo2 hardware:
  - Update the vendor Kconfig to add gizmo2
  - Update the mainboard Kconfig
  - Update devicetree
  - Add support in for the soldered down DDR3
  - Update the CODEC verb data
  - Update the graphics connector settings
  - Adjust the temperature thresholds for the fan

What's missing:
  - Interrupt routing tables

Gizmo2 can boot DOS and Ubuntu 14.10.

Change-Id: I3d7202957c082974689f2a8c04d8cd33dbdc1a89
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/7722
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
gizmosphere/gizmo2: Add the gizmo2 IRQ routing

Change-Id: Ic00790eedd48a2b78620fea329464701cd294cbb
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/7723
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>