This adds support for the i.MX6UL Technexion Pico Hobbit. The board
comes with different amounts of RAM. We create one image for the 256MB
and one for the 512MB variant.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
   ---
   v1 -> v2: - removed already prepared clock setup
   v2 -> v3: - added phy-reset-post-delay as the support is now available

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>