PCI: mediatek-gen3: Change driver name to mtk-pcie-gen3

driver_register() will refuse to register another driver with the same name.
This change allows pcie-mediatek-gen3 to coexist with pcie-mediatek built into
the kernel.

Link: https://lore.kernel.org/r/20220505083907.86598-1-nbd@nbd.name
Fixes: d3bf75b5 ("PCI: mediatek-gen3: Add MediaTek Gen3 driver for MT8192")
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: NAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: NJianjun Wang <jianjun.wang@mediatek.com>

drivers/pci/controller/pcie-mediatek-gen3.c

@@ -1071,7 +1071,7 @@ static struct platform_driver mtk_pcie_driver = {
 	.probe = mtk_pcie_probe,
 	.remove = mtk_pcie_remove,
 	.driver = {
-		.name = "mtk-pcie",
+		.name = "mtk-pcie-gen3",
 		.of_match_table = mtk_pcie_of_match,
 		.pm = &mtk_pcie_pm_ops,
 	},