mmc: meson-mx-sdhc: Avoid cast to incompatible function type

Rather than casting mmc_free_host to an incompatible function type,
provide a trivial wrapper with the correct signature for the use-case.

Reported by clang-16 with W=1:

.../meson-mx-sdhc-mmc.c:791:38: error: cast from 'void (*)(struct mmc_host *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./include/linux/device.h:265:38: note: expanded from macro 'devm_add_action_or_reset'
__devm_add_action_or_reset(release, action, data, #action)
^~~~~~

The same approach is taken in litex_mmc.c with the function
litex_mmc_free_host_wrapper(). There may be scope for consolidation.

No functional change intended.
Compile tested only.

Signed-off-by: Simon Horman <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Reviewed-by: Martin Blumenstingl <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/meson-mx-sdhc-mmc.c

···
 	regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
 }
 
+static void meason_mx_mmc_free_host(void *data)
+{
+       mmc_free_host(data);
+}
+
 static int meson_mx_sdhc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
···
 	if (!mmc)
 		return -ENOMEM;
 
-	ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
-				       mmc);
+	ret = devm_add_action_or_reset(dev, meason_mx_mmc_free_host, mmc);
 	if (ret) {
 		dev_err(dev, "Failed to register mmc_free_host action\n");
 		return ret;