soc: xilinx: vcu: drop useless success message

soc: xilinx: vcu: drop useless success message

The message that the driver was successfully probed only adds useless
noise. Drop the message.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Hyun Kwon <hyun.kwon@xilinx.com>
Link: https://lore.kernel.org/r/20201109134818.4159342-2-m.tretter@pengutronix.de
Signed-off-by: Michal Simek <michal.simek@xilinx.com>