This patch disables the VGA text console for AVR32 architecture since
it does not provide the vga.h include file.

AVR32 users should use framebuffer console instead if they need a
console on an attached display.
Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>