Goldfish: move back to yaffs2 images, correct kernel name.
Add a tool to build the sdcard for the emulator.
Include sdcard build for the emulator.

Signed-off-by: Dmitrijs Ledkovs <dmitrijs.ledkovs@canonical.com>
Add MKSDCARD host tool dependency.

Signed-off-by: Dmitrijs Ledkovs <dmitrijs.ledkovs@canonical.com>
Revert "Add MKSDCARD host tool dependency."

This reverts commit 2bcb7708c038a65d4d9b5bc4a5b9c398f35421c9.
Revert "Include sdcard build for the emulator."

This reverts commit 5faffcd0599d0590da6cf672d2acb10acf5328ad.
Make build-emulator-sdcard produce $OUT/sdcard.img
Merge remote-tracking branch 'phablet/phablet-saucy' into ubuntu-touch-vision