reset: microchip-sparx5: allow building as a module

Set RESET_MCHP_SPARX5 as a tristate and add MODULE_DEVICE_TABLE() to
allow building this driver as a module.
Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220617103730.490588-1-clement.leger@bootlin.com

drivers/reset/Kconfig

@@ -115,7 +115,7 @@ config RESET_LPC18XX
 	  This enables the reset controller driver for NXP LPC18xx/43xx SoCs.
 
 config RESET_MCHP_SPARX5
-	bool "Microchip Sparx5 reset driver"
+	tristate "Microchip Sparx5 reset driver"
 	depends on ARCH_SPARX5 || SOC_LAN966 || COMPILE_TEST
 	default y if SPARX5_SWITCH
 	select MFD_SYSCON

drivers/reset/reset-microchip-sparx5.c

@@ -149,6 +149,7 @@ static const struct of_device_id mchp_sparx5_reset_of_match[] = {
 	},
 	{ }
 };
+MODULE_DEVICE_TABLE(of, mchp_sparx5_reset_of_match);
 
 static struct platform_driver mchp_sparx5_reset_driver = {
 	.probe = mchp_sparx5_reset_probe,
@@ -158,12 +159,7 @@ static struct platform_driver mchp_sparx5_reset_driver = {
 	},
 };
 
-static int __init mchp_sparx5_reset_init(void)
-{
-	return platform_driver_register(&mchp_sparx5_reset_driver);
-}
-
-postcore_initcall(mchp_sparx5_reset_init);
+module_platform_driver(mchp_sparx5_reset_driver);
 
 MODULE_DESCRIPTION("Microchip Sparx5 switch reset driver");
 MODULE_AUTHOR("Steen Hegelund <steen.hegelund@microchip.com>");