MIPS: ath79: Remove CLK_IS_ROOT

This flag is a no-op now (see commit 47b0eeb3 "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13133/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/ath79/clock.c

@@ -44,7 +44,7 @@ static struct clk *__init ath79_add_sys_clkdev(
 	struct clk *clk;
 	int err;
 
-	clk = clk_register_fixed_rate(NULL, id, NULL, CLK_IS_ROOT, rate);
+	clk = clk_register_fixed_rate(NULL, id, NULL, 0, rate);
 	if (!clk)
 		panic("failed to allocate %s clock structure", id);