phy: rockhip-usb: 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.

Cc: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/phy-rockchip-usb.c

@@ -216,7 +216,7 @@ static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
 			init.parent_names = &clk_name;
 			init.num_parents = 1;
 		} else {
-			init.flags = CLK_IS_ROOT;
+			init.flags = 0;
 			init.parent_names = NULL;
 			init.num_parents = 0;
 		}