arm64: a37xx: pci: Fix printing debug messages

Value pcie->dev in function pcie_advk_probe() is not initialized yet
so use dev as argument for dev_dbg()/dev_warn().

Function pcie_advk_wait_pio() itself prints error message on failure
so do not print duplicate error message in caller.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>