clk: clk-loongson2: Switch to use devm_clk_hw_register_fixed_rate_parent_data()

Since commit 706ae6446494 ("clk: fixed-rate: add
devm_clk_hw_register_fixed_rate_parent_data()"), we can use the
devm_clk_hw_register_fixed_rate_parent_data() helper and from then on
there is no need to manually unregister the fixed rate hw.

Since clk_hw_unregister_fixed_rate() was not called before, we also fix
the memory leak that was present.

Signed-off-by: Binbin Zhou <[e-mail]>
Link: https://lore.kernel.org/r/87[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/clk-loongson2.c

···
 						       &clp->clk_lock);
 			break;
 		case CLK_TYPE_FIXED:
-			hw = clk_hw_register_fixed_rate_parent_data(dev, p->name, pdata,
-								    0, p->fixed_rate);
+			hw = devm_clk_hw_register_fixed_rate_parent_data(dev, p->name, pdata,
+									 0, p->fixed_rate);
 			break;
 		default:
 			return dev_err_probe(dev, -EINVAL, "Invalid clk type\n");