PCI: aardvark: Remove redundant dev_err call in advk_pcie_probe()

devm_ioremap_resource() emits an error message already, so remove the
dev_err() call in advk_pcie_probe() to avoid redundant error messages.

Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>