Enabling Armada 37xx rWTM driver. This gives the kernel access to random
number generator, if provided by the rWTM firmware.
Note that the driver is called turris-mox-rwtm because it was initially
written for Turris MOX, but will also work on other Armada 37xx
platforms, if they use rWTM firmware from CZ.NIC [1].
It makes sense to have this driver built-in, so that kernel has access
to random number generator without needing to load any drivers.
[1] https://gitlab.nic.cz/turris/mox-boot-builder
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andre Heider <a.heider@gmail.com>
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