MIPS: alchemy: 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: Stephen Boyd <sboyd@codeaurora.org>
Cc: Manuel Lauss <manuel.lauss@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13134/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/alchemy/common/clock.c

@@ -1043,8 +1043,7 @@ static int __init alchemy_clk_init(void)
 
 	/* Root of the Alchemy clock tree: external 12MHz crystal osc */
 	c = clk_register_fixed_rate(NULL, ALCHEMY_ROOT_CLK, NULL,
-					   CLK_IS_ROOT,
-					   ALCHEMY_ROOTCLK_RATE);
+					   0, ALCHEMY_ROOTCLK_RATE);
 	ERRCK(c)
 
 	/* CPU core clock */