kernel: Add kernel modules to partition file list

This is required to ensure that kernel modules end up on the final
partition images when `BUILD_BROKEN_INCORRECT_PARTITION_IMAGES`
environment variable or board config variable is not set.

See https://android.googlesource.com/platform/build/+/152cdfab7c2a02a64b24a706566183d863db7a38


for more information.

Co-authored-by: Bruno Martins <bgcngm@gmail.com>
Change-Id: I8b6040e03589bde2af4e161c891ded237a9bb335