um: nommu: add userspace runner processes

For NOMMU there are not separate address spaces for
each userspace process group, which on the one hand
means we cannot start them on demand, but on the
other means we can just have one for each (virtual)
CPU, and map all of the memory into them.

Implement such processes, and the remaining bits
needed to compile the kernel without CONFIG_MMU.

Link: https://patch.msgid.link/20260723113633.2184dce9413e.I9f810f3ed177d6dc980cad36c231f8c745dee48f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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