image_types_tegra: allow the underlying filesystem type to be overridden
image_types_tegra: allow the underlying filesystem type to be overridden

The usage of ext4 with a yocto image can cause slow loading of the kernel image from
u-boot (See #42).  As a workaround, an ext3 filesystem can be used, so allow
integrators to override the default ext4 filesystem.

(PR #44)

Signed-off-by: Derek Straka <e1c79a582b6629e6b39e9679f4bb964d25db4aa8@asterius.io>
Signed-off-by: Matt Madison <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@madison.systems>
madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra