configs: move CONFIG_MXC_OCOTP to Kconfig

configs: move CONFIG_MXC_OCOTP to Kconfig

While commit 3e020f03e94f ("driver: misc: add MXC_OCOTP Kconfig entry")
introduced a Kconfig entry it did not actually migrate all
configurations to using it.

As CONFIG_MXC_OCOTP was in mx{6/7}_common.h enable it by default on
those architectures. Additionally, also enable it on ARCH_IMX8M and
ARCH_VF610 where all current members enabled it through their legacy
configuration header files.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>