percpu: make @dyn_size mandatory for pcpu_setup_first_chunk()

Now that all actual first chunk allocation and copying happen in the
first chunk allocators and helpers, there's no reason for
pcpu_setup_first_chunk() to try to determine @dyn_size automatically.
The only left user is page first chunk allocator.  Make it determine
dyn_size like other allocators and make @dyn_size mandatory for
pcpu_setup_first_chunk().

Signed-off-by: Tejun Heo <tj@kernel.org>