update the i386 defconfig

The i386 defconfig wasn't updated for ages.

Instead of running "make oldconfig" on the old defconfig and trying to
give reasonable answers at all new options, this patch replaces it with
the one I'm using in 2.6.16-rc1.

This way, it's a .config that is confirmed to work on at least one
computer in the world.  ;-)
Signed-off-by: Adrian Bunk <bunk@stusta.de>