layers: Track if VK_KHR_shader_draw_parameters is enabled
layers: Track if VK_KHR_shader_draw_parameters is enabled

We need to know this in order to determine whether the corresponding
shader capability is acceptable.

Signed-off-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools