arm64: zynqmp: Remove can aliases from zc1751

Networking subsystem is not using aliases that's why remove them for can
devices. There is also no any other Xilinx ZynqMP DT file with them.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/475a60fc4d01ba9c61579801fb84620b6905dcad.1623684253.git.michal.simek@xilinx.com