mmc: sdhci-of-k1: Drop the use of sdhci_pltfm_free()

Since the devm_mmc_alloc_host() helper is already in use,
sdhci_pltfm_free() is no longer needed.

Cc: Yixun Lan <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Reviewed-by: Yixun Lan <[e-mail]>
Signed-off-by: Binbin Zhou <[e-mail]>
Link: https://lore.kernel.org/r/e9[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci-of-k1.c

···
 	return 0;
 
 err_pltfm:
-	sdhci_pltfm_free(pdev);
 	return ret;
 }