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In preparation of adding memory permission attribute management to the pool allocator, split off the locking of the pool metadata into a separate lock. This is an improvement in itself, given that pool allocations can only interfere with the page allocation bookkeeping if pool pages are allocated or released. But it is also required to ensure that the permission attribute management does not deadlock, given that it may trigger page table splits leading to additional page tables being allocated. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>