soc: samsung: exynos-chipid: avoid soc_device_to_device()

soc_device_to_device() seems to be discouraged [1] so remove it in favor
of printing info message with platform device.  This will only change
the prefix in the info message from "soc soc0: " to "exynos-chipid
10000000.chipid:".

[1] https://lore.kernel.org/lkml/20191111052741.GB3176397@kroah.com/Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Sylwester Nawrocki <snawrocki@kernel.org>
Tested-by: Sylwester Nawrocki <snawrocki@kernel.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20210919093114.35987-2-krzysztof.kozlowski@canonical.com

drivers/soc/samsung/exynos-chipid.c

@@ -104,8 +104,7 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, soc_dev);
 
-	dev_info(soc_device_to_device(soc_dev),
-		 "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
+	dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
 		 soc_dev_attr->soc_id, product_id, revision);
 
 	return 0;