[NOT-FOR-UPSTREAM] clk: Make clk_ignore_unused public

Make clk_ignore_unused public, so the StarFive JH7100 Clock Generator
driver can set the flag.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

drivers/clk/clk.c

@@ -1282,7 +1282,7 @@ unprepare_out:
 		clk_core_disable_unprepare(core->parent);
 }
 
-static bool clk_ignore_unused __initdata;
+bool clk_ignore_unused __initdata;
 static int __init clk_ignore_unused_setup(char *__unused)
 {
 	clk_ignore_unused = true;