i2c: amd-isp: Initialize unique adapter name

Initialize unique name for amdisp i2c adapter, which is used
in the platform driver to detect the matching adapter for
i2c_client creation.

Add definition of amdisp i2c adapter name in a new header file
(include/linux/soc/amd/isp4_misc.h) as it is referred in different
driver modules.

Tested-by: Randy Dunlap <[e-mail]>
Signed-off-by: Pratap Nirujogi <[e-mail]>
Signed-off-by: Andi Shyti <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

MAINTAINERS

···
 L:	[e-mail]
 S:	Maintained
 F:	drivers/i2c/busses/i2c-designware-amdisp.c
+F:	include/linux/soc/amd/isp4_misc.h
 
 SYNOPSYS DESIGNWARE MMC/SD/SDIO DRIVER
 M:	Jaehoon Chung <[e-mail]>

drivers/i2c/busses/i2c-designware-amdisp.c

···
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/soc/amd/isp4_misc.h>
 
 #include "i2c-designware-core.h"
 
···
 
 	adap = &isp_i2c_dev->adapter;
 	adap->owner = THIS_MODULE;
+	scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME);
 	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
 	adap->dev.of_node = pdev->dev.of_node;
 	/* use dynamically allocated adapter id */

include/linux/soc/amd/isp4_misc.h

···
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#ifndef __SOC_ISP4_MISC_H
+#define __SOC_ISP4_MISC_H
+
+#define AMDISP_I2C_ADAP_NAME "AMDISP DesignWare I2C adapter"
+
+#endif