x86/efi: Use early_memunmap() to squelch sparse errors

The kbuild reports the following sparse errors,

>> arch/x86/platform/efi/quirks.c:242:23: sparse: incorrect type in >> argument 1 (different address spaces)
   arch/x86/platform/efi/quirks.c:242:23:    expected void [noderef] <asn:2>*addr
   arch/x86/platform/efi/quirks.c:242:23:    got void *[assigned] tablep
>> arch/x86/platform/efi/quirks.c:245:23: sparse: incorrect type in >> argument 1 (different address spaces)
   arch/x86/platform/efi/quirks.c:245:23:    expected void [noderef] <asn:2>*addr
   arch/x86/platform/efi/quirks.c:245:23:    got struct efi_setup_data *[assigned] data

Dave Young had made previous attempts to convert the early_iounmap()
calls to early_memunmap() but ran into merge conflicts with commit
9e5c33d ("mm: create generic early_ioremap() support").

Now that we've got that commit in place we can switch to using
early_memunmap() since we're already using early_memremap() in
efi_reuse_config().

Cc: Dave Young <dyoung@redhat.com>
Cc: Saurabh Tangri <saurabh.tangri@intel.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

arch/x86/platform/efi/quirks.c

@@ -239,10 +239,10 @@ int __init efi_reuse_config(u64 tables, int nr_tables)
 			((efi_config_table_64_t *)p)->table = data->smbios;
 		p += sz;
 	}
-	early_iounmap(tablep, nr_tables * sz);
+	early_memunmap(tablep, nr_tables * sz);
 
 out_memremap:
-	early_iounmap(data, sizeof(*data));
+	early_memunmap(data, sizeof(*data));
 out:
 	return ret;
 }