ARM: dory: Set the gpio configuration for uart console

Set the gpios for uart to the uart funtion only if the uart console is
enabled. Otherwise, set the gpios to pull-downed gpios.

Change-Id: I834b7592fec89ad73a04b105f02bd258a1b78dbb
Signed-off-by: Devin Kim <dojip.kim@lge.com>