misc: imx: remove DM dependency for ocotp driver in SPL

misc: imx: remove DM dependency for ocotp driver in SPL

The ocotp driver is available for regular and SPL builds using the
(SPL_)MXC_OCOTP configuration. Also, the ocotp driver does not support
the driver model (DM) configuration.

But, for SPL builds, the SPL_MXC_OCOTP configuration depends on
SPL_MISC which implies on SPL_DM.

This commit replaces the dependency on SPL_MISC with SPL_DRIVERS_MISC.
So the only requirement is to have enabled miscellaneous drivers for
the SPL.

Signed-off-by: Jean-Marie Lemetayer <j.lemetayer@kerlink.fr>