LF-2928: clk: imx8mp: fix mclk register fail

LF-2928: clk: imx8mp: fix mclk register fail

Those MX8MP_SAIn_MCLK are not used by CCM clock controller in DTS,
so we can't get those clk in driver which results in the following
boot error messages during probe:
i.MX clk 324: register failed with -2
i.MX clk 325: register failed with -2
i.MX clk 330: register failed with -2
...

As those SAIn_MCLK does not belong to CCM and can be referenced
directly in DT, we can just delete them in CCM clock driver.

Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Joy Zou <joy.zou@nxp.com>