clk: scpi: mark scpi_clk_match as maybe unused

The scpi_clk_match (struct of_device_id) is referenced only with
CONFIG_OF builds thus mark it as __maybe_unused:

drivers/clk/clk-scpi.c:132:34: warning:
‘scpi_clk_match’ defined but not used [-Wunused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Sudeep Holla <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/clk-scpi.c

···
 	.set_rate = scpi_dvfs_set_rate,
 };
 
-static const struct of_device_id scpi_clk_match[] = {
+static const struct of_device_id scpi_clk_match[] __maybe_unused = {
 	{ .compatible = "arm,scpi-dvfs-clocks", .data = &scpi_dvfs_ops, },
 	{ .compatible = "arm,scpi-variable-clocks", .data = &scpi_clk_ops, },
 	{}