linux-yocto-tiny-kexecboot: initial defconfig updates for 3.10

Zaurus configuration was based on the 3.2 kernel and when the
recipe was removed we simply upgraded whithout much testing.
Result: the kernel is not booting...

This first pass of cleaning should help to standardize and
possibly move back using the defconfig made with do_savedefconfig.

Those are much shorter and generally don't change much.

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>