vulkaninfo: Add VK_KHR_8bit_storage support
vulkaninfo: Add VK_KHR_8bit_storage support

Added output for VkPhysicalDevice8bitStorageFeaturesKHR
struct info

Change-Id: I906a49e6e541e95cbd3b48db7b836921d1f09f33

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