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wifi: optimize `WifiPhy::GetStaticPhyEntity()`

Tolik Zinovyev requested to merge tolikzinovyev/ns-3-dev:static-phy-entity-optimization into master

I ran a profiler on my wifi network simulation program and noticed that WifiPhy::GetStaticPhyEntity() was taking 1% of the CPU time due to an expensive std::map lookup. This PR replaces the std::map with an std::vector. Now the cost of WifiPhy::GetStaticPhyEntity() is 0.03%.

Arch linux, Intel Core i5-8250U.

Edited by Tolik Zinovyev

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