vkr: add missing sType in VkPhysicalDeviceGroupProperties

Merged Yiwei Zhang requested to merge zzyiwei/virglrenderer:fix-pdevgroup-validation into master

Silence below:

Validation Error: [ VUID-VkPhysicalDeviceGroupProperties-sType-sType ] Object 0: VK_NULL_HANDLE, type = VK_OBJECT_TYPE_DEVICE; | MessageID = 0xc9edee8b | vkEnumeratePhysicalDeviceGroups: parameter pPhysicalDeviceGroupProperties[0].sType must be VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES The Vulkan spec states: sType must be VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES (https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VUID-VkPhysicalDeviceGroupProperties-sType-sType)

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