ipq806x: gcc: add support for child probe

Add support for child probing needed for tsens driver that share the
same regs of gcc for this platform.

Signed-off-by: Ansuel Smith <[e-mail]>
Reviewed-by: Amit Kucheria <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/qcom/gcc-ipq806x.c

···
 	regmap_write(regmap, 0x3cf8, 8);
 	regmap_write(regmap, 0x3d18, 8);
 
-	return 0;
+	return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 }
 
 static struct platform_driver gcc_ipq806x_driver = {