bitbake.conf: use ROOTFS_SIZE for gzip'd images
bitbake.conf: use ROOTFS_SIZE for gzip'd images

Make ext2.gz and ext3.gz images use ROOTFS_SIZE parameter for genext2s (as
non-compressed ext2 and ext3 does).

This allows to use IMAGE_EXTRA_SPACE configuration.

Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@openembedded.org>

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