x86: cougarcanyon2: Convert to text environment

Use the common include. The existing environment includes "vga" but that
is not valid anymore, so let it use vidconsole

Drop everything from the config.h file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> # Intel Edison
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>