meta-facebook: meta-yosemitev2: add support for host console in SPL

This feature adds four 1S server console through debug card
connected to YosemiteV2 during boot.

Tested:
  BMC and four 1 server uart console message getting through USB debug card by change position in
  the knob (Adaptor card).
  The YV2 needs to power ON after every change in the knob position to take effect and run time
  debug console handler will take care by application after boot.

(From meta-facebook rev: bf07eebdca7175ded4c96185fe4b182e55d09772)

Signed-off-by: Manikandan Elumalai <manikandan.hcl.ers.epl@gmail.com>
Change-Id: I66939c8a04cd8fa97b6fdae91ed0b52086c8d0d5
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>