mailbox: change mailbox-mpfs compatible string

The Polarfire SoC is currently using two different compatible string
prefixes. Fix this by changing "polarfire-soc-*" strings to "mpfs-*" in
its system controller in order to match the compatible string used in
the soc binding and device tree.

Signed-off-by: Conor Dooley <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

drivers/mailbox/mailbox-mpfs.c

···
 }
 
 static const struct of_device_id mpfs_mbox_of_match[] = {
-	{.compatible = "microchip,polarfire-soc-mailbox", },
+	{.compatible = "microchip,mpfs-mailbox", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mpfs_mbox_of_match);