image_type_tezi.bbclass: add tezi_deploy_dt_overlays prefuncs

Move the code deploying dtb overlays to a prefuncs
tezi_deploy_dt_overlays of do_image_bootfs, and put all prefuncs of
do_image_bootfs, do_image_teziimg, do_image_teziimg_distro to variables
so that they could be overridden in other meta layers. For instance, an
end user might want to write his/her own image.json file according to
his/her partitions layout.

Also fix a missing double quotes.

Related-to: TOR-1334
Signed-off-by: Ming Liu <ming.liu@toradex.com>

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