mips: pci-mt7620: use dev_info() to log PCIe device detection result

Usually, We only need to print the error log when there is a PCIe card but
initialization fails. Whether the driver finds the PCIe card or not is the
expected behavior. So it's better to log these information with dev_info().

Tested on MT7628AN router Motorola MWR03.

Signed-off-by: Shiji Yang <[e-mail]>
Reviewed-by: Sergio Paracuellos <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/pci/pci-mt7620.c

···
 		rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
 		if (ralink_soc == MT762X_SOC_MT7620A)
 			rt_sysc_m32(LC_CKDRVPD, PDRV_SW_SET, PPLL_DRV);
-		dev_err(&pdev->dev, "PCIE0 no card, disable it(RST&CLK)\n");
+		dev_info(&pdev->dev, "PCIE0 no card, disable it(RST&CLK)\n");
 		return -1;
 	}
 
···
 			dev->bus->number, slot);
 		return 0;
 	}
-	dev_err(&dev->dev, "card - bus=0x%x, slot = 0x%x irq=%d\n",
+	dev_info(&dev->dev, "card - bus=0x%x, slot = 0x%x irq=%d\n",
 		dev->bus->number, slot, irq);
 
 	/* configure the cache line size to 0x14 */