* factor out serial hardware init

* factor out serial hardware init
* add reverse color support for serial
* add cursor enable/disable support for serial
* fix tinycurses compilation if serial is disabled
* add functions to query whether serial or vga console is enabled in tinycurses
* initialize uninitialized COLOR_PAIRS variable
* implement has_colors(), wredrawln() functions in curses

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3604 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1