Remove some outdated and/or unnecessary information, and add updated
information about the toolchain and buildroot.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Patch by Haavard Skinnemoen, 6 Sep 2006 16:23:02 +0200

This patch adds common infrastructure code for the Atmel AVR32
architecture. See doc/README.AVR32 for details.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>