layers: Add Dispatch helpers for GPDP2 calls

[spencer-lunarg]

We make a lot of internal calls to VK_KHR_get_physical_device_properties2 functions, but we need to make sure to use the DispatchGetPhysicalDeviceFormatProperties2 vs DispatchGetPhysicalDeviceFormatProperties2KHR depending if still using Vulkan 1.0 or not

This adds a DispatchGetPhysicalDevice*2Helper` for all those calls and substitutes them everywhere

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[spencer-lunarg]

@aqnuep just a friendly ping on this, (no rush as will take a look at it until Monday, but just peeking at open PRs right now)