xtensa: sample_controller: smaller intermediate build artifacts

For some weird reasons, if the sections in linker script are not
in memory address order, there are lots of padding involved in
zephyr_pre0.elf. This moves the .intList section to its memory
ordered location. When building hello_world, this shrinks
zephyr_pre0.elf from 512MB to 339KB.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>