nxp_adsp: linker: Add snippets to linker script

The xtensa/nxp_adsp_imx8m linker script is missing
the necessary include statements for linker snippets.
So we need to add them.

This fixes compile warnings like: orphan section `.unstable_id'
from `modules/chre/lib..__modules__lib__chre__platform__zephyr.a
(version.cc.obj)' being placed in section `.unstable_id'.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>