clk: sifive: prci: fix module autoloading

Add MODULE_DEVICE_TABLE(), so modules could be properly autoloaded
based on the alias from of_device_id table. Clocks are considered core
components, so usually they are built-in, however these can be built and
used as modules on some generic kernel.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Samuel Holland <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/sifive/sifive-prci.c

···
 	{.compatible = "sifive,fu740-c000-prci", .data = &prci_clk_fu740},
 	{}
 };
+MODULE_DEVICE_TABLE(of, sifive_prci_of_match);
 
 static struct platform_driver sifive_prci_driver = {
 	.driver = {