layers: GH785, Validate rasterinfo->polygonMode
layers: GH785, Validate rasterinfo->polygonMode

If fillModeNonSolid is not enabled, polygonMode cannot be set to
POINT or LINE.

Change-Id: I6cfdfac8f5c9ff7d27b94bf0aa80ae1249b0ce25

elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers