clk: imx: fracn-gppll: disable hardware select control

When programming PLL, should disable Hardware control select to make PLL
controlled by register, not hardware inputs through OSCPLL.

Fixes: 1b26cb8a ("clk: imx: support fracn gppll")
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230403095300.3386988-3-peng.fan@oss.nxp.com


Signed-off-by: Abel Vesa <abel.vesa@linaro.org>