ARM: orion5x: Remove CLK_IS_ROOT

This flag is a no-op now (see commit 47b0eeb3dc "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.

Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/mach-orion5x/common.c

@@ -66,8 +66,7 @@ static struct clk *tclk;
 
 void __init clk_init(void)
 {
-	tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
-				       orion5x_tclk);
+	tclk = clk_register_fixed_rate(NULL, "tclk", NULL, 0, orion5x_tclk);
 
 	orion_clkdev_init(tclk);
 }