ARM: mxs: dt: cfa10057: remove hogpins

Necessary pins are now grabbed by respective drivers. Unecessary hogpins are
simply removed.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>