Support Broadwell-U

Injecting errors on a Broadwell-U system shows the following:
"mcelog: Family 6 Model 3d CPU: only decoding architectural errors".
06_3DH is a valid family_model in SDM, so add it as supported.

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>