srcu: Use static init for statically allocated in-module srcu_struct

Further shrinking the srcu_struct structure is eased by requiring
that in-module srcu_struct structures rely more heavily on static
initialization.  In particular, this preserves the property that
a module-load-time srcu_struct initialization can fail only due
to memory-allocation failure of the per-CPU srcu_data structures.
It might also slightly improve robustness by keeping the number of memory
allocations that must succeed down percpu_alloc() call.

This is in preparation for splitting an srcu_usage structure out
of the srcu_struct structure.

[ paulmck: Fold in [email protected] feedback. ]

Cc: Christoph Hellwig <[email protected]>
Tested-by: Sachin Sant <[email protected]>
Tested-by: "Zhang, Qiang1" <[email protected]>
Tested-by: Joel Fernandes (Google) <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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