ARM: tegra: apalis-tk1: drop obsolete spidev nodes

Drop obsolete spidev device tree nodes as nowadays one should do this
by binding the spidev driver to specific instances/chip selects at
runtime.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>