crypto: ccp - Constify 'dev_vdata' member

sp_device->dev_vdata points to only const data (see 'static const struct
sp_dev_vdata dev_vdata'), so can be made pointer to const for code
safety.

Update also sp_get_acpi_version() function which returns this pointer to
'pointer to const' for code readability, even though it is not needed.

On the other hand, do not touch similar function sp_get_of_version()
because it will be immediately removed in next patches.

Acked-by: Tom Lendacky <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/ccp/sp-dev.h

···
 
 	struct device *dev;
 
-	struct sp_dev_vdata *dev_vdata;
+	const struct sp_dev_vdata *dev_vdata;
 	unsigned int ord;
 	char name[SP_MAX_NAME_LEN];
 

drivers/crypto/ccp/sp-platform.c

···
 	return NULL;
 }
 
-static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
+static const struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
 {
 	const struct acpi_device_id *match;
 
 	match = acpi_match_device(sp_acpi_match, &pdev->dev);
 	if (match && match->driver_data)
-		return (struct sp_dev_vdata *)match->driver_data;
+		return (const struct sp_dev_vdata *)match->driver_data;
 
 	return NULL;
 }