buildhistory.bbclass: create image directory when needed

buildhistory_get_imageinfo() assumed that the buildhistory directory
for the image had already been created earlier. That assumption is not
true for special images (like the virtual swupd images from
meta-swupd) where the entire traditional do_rootfs/do_image is
skipped.

Creating files-in-image.txt still makes sense for such images, so
support them by creating the directory also in
buildhistory_get_imageinfo().

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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