cleanup some exynos5250 uart code

This just cleans out some unused headers and tidies up the early
serial code.

TODO: Clean-up or replace FDT code, make "base_port" easier to
configure.

A bit of cleanup based on earlier patches.

Change-Id: Ie77ee6d4935346e0053c09252055662f1a45d5f5
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/2084
Tested-by: build bot (Jenkins)
1 file changed