x86/platform/intel-mid: Remove unused leftovers (msic_audio)

Commit 05f4434b ("ASoC: Intel: remove mfld_machine") removed the
driver, no need to have support files for it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/x86/platform/intel-mid/device_libs/Makefile

@@ -8,7 +8,6 @@ obj-$(subst m,y,$(CONFIG_BRCMFMAC_SDIO)) += platform_bcm43xx.o
 obj-$(subst m,y,$(CONFIG_BT_HCIUART_BCM)) += platform_bt.o
 # IPC Devices
 obj-$(subst m,y,$(CONFIG_MFD_INTEL_MSIC)) += platform_msic.o
-obj-$(subst m,y,$(CONFIG_SND_MFLD_MACHINE)) += platform_msic_audio.o
 obj-$(subst m,y,$(CONFIG_GPIO_MSIC)) += platform_msic_gpio.o
 obj-$(subst m,y,$(CONFIG_MFD_INTEL_MSIC)) += platform_msic_ocd.o
 obj-$(subst m,y,$(CONFIG_MFD_INTEL_MSIC)) += platform_msic_battery.o

arch/x86/platform/intel-mid/device_libs/platform_msic_audio.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * platform_msic_audio.c: MSIC audio platform data initialization file
- *
- * (C) Copyright 2013 Intel Corporation
- * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/scatterlist.h>
-#include <linux/init.h>
-#include <linux/sfi.h>
-#include <linux/platform_device.h>
-#include <linux/mfd/intel_msic.h>
-#include <asm/intel-mid.h>
-
-#include "platform_msic.h"
-
-static void *msic_audio_platform_data(void *info)
-{
-	struct platform_device *pdev;
-
-	pdev = platform_device_register_simple("sst-platform", -1, NULL, 0);
-
-	if (IS_ERR(pdev)) {
-		pr_err("failed to create audio platform device\n");
-		return NULL;
-	}
-
-	return msic_generic_platform_data(info, INTEL_MSIC_BLOCK_AUDIO);
-}
-
-static const struct devs_id msic_audio_dev_id __initconst = {
-	.name = "msic_audio",
-	.type = SFI_DEV_TYPE_IPC,
-	.delay = 1,
-	.msic = 1,
-	.get_platform_data = &msic_audio_platform_data,
-};
-
-sfi_device(msic_audio_dev_id);