feat(plat/rcar3): add process of SSCG setting for R-Car D3

- Added the condition where output the SSCG (MD12) setting
  to log for R-Car D3.
- Added the process to switching the bit rate of SCIF by the
  SSCG (MD12) setting value for R-Car D3.

Signed-off-by: Hideyuki Nitta <hideyuki.nitta.jf@hitachi.com>
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Iaf07fa4df12dc233af0b57569ee4fa9329f670a9
2 files changed