can: softing: use KBUILD_MODNAME instead of hard coded names

The driver uses the string "softing" to populate platform_driver::name
and can_bittiming_const::name. KBUILD_MODNAME also evaluates to
"softing". Use KBUILD_MODNAME and get rid on the hardcoded string
names.
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20220726082707.58758-5-mailhol.vincent@wanadoo.frSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/softing/softing_main.c

@@ -612,7 +612,7 @@ static const struct net_device_ops softing_netdev_ops = {
 };
 
 static const struct can_bittiming_const softing_btr_const = {
-	.name = "softing",
+	.name = KBUILD_MODNAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
 	.tseg2_min = 1,
@@ -846,7 +846,7 @@ static int softing_pdev_probe(struct platform_device *pdev)
 
 static struct platform_driver softing_driver = {
 	.driver = {
-		.name = "softing",
+		.name = KBUILD_MODNAME,
 	},
 	.probe = softing_pdev_probe,
 	.remove = softing_pdev_remove,