Add support for VK_KHR_shared_presentable_image for headless backend
Support for VK_KHR_shared_presentable image added in swapchain_base. Headless backend will report support for it through vkGetPhysicalDeviceSurfacePresentModesKHR.
Signed-off-by: Dennis Wildmark dennis.wildmark@arm.com Change-Id: Ibbbab0b8c8137fdd41df9889d7e183a8259c83ba