PCI: j721e: Use dev_err_probe() in the probe() function

Use dev_err_probe() instead of dev_err() in the probe() function to
simplify the code and standardize the error output.

Link: https://lore.kernel.org/linux-pci/20240102-j7200-pcie-s2r-v7-3-a2f9156da6c3@bootlin.com


Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>