clk: imx: imx8mm: Change the 'nand_usdhc_bus' clock to non-critical one

The 'nand_usdhc_bus' clock is only need to be enabled when usdhc
or nand module is active, so change it to non-critical clock type.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240607133347.3291040-11-peng.fan@oss.nxp.com


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