sanitycheck: look for misaligned XIP VMA/LMA addresses

XIP is currently implemented in Zephyr by copying only the RW
sections from flash into RAM. For these sections, if the VMA spacing
is different than the LMA spacing the sections in RAM will not be
at the right addresses. Warn about this situation.

Change-Id: I59a55fc27703103e37a7f0bbc34f236047621e0e
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>