ARM: clk: imx: remove the CLK_SET_RATE_NO_REPARENT for imx_clk_mux_flags

ARM: clk: imx: remove the CLK_SET_RATE_NO_REPARENT for imx_clk_mux_flags

The clocks for Quadspi controller may be different when different
NOR flashes are connected to the board.

But the CLK_SET_RATE_NO_REPARENT flag in the current imx_clk_mux_flags
makes the clock do not have the re-parent capability.

This patch removes the CLK_SET_RATE_NO_REPARENT for imx_clk_mux_flags.
It makes the Quadspi happy.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>