renderer_vulkan: Rename VKDevice to Device

The "VK" prefix predates the "Vulkan" namespace. It was carried around
the codebase for consistency. "VKDevice" currently is a bad alias with
"VkDevice" (only an upcase character of difference) that can cause
confusion. Rename all instances of it.

src/video_core/renderer_vulkan/vk_descriptor_pool.cpp

@@ -32,7 +32,7 @@ void DescriptorAllocator::Allocate(std::size_t begin, std::size_t end) {
     descriptors_allocations.push_back(descriptor_pool.AllocateDescriptors(layout, end - begin));
 }
 
-VKDescriptorPool::VKDescriptorPool(const VKDevice& device_, VKScheduler& scheduler)
+VKDescriptorPool::VKDescriptorPool(const Device& device_, VKScheduler& scheduler)
     : device{device_}, master_semaphore{scheduler.GetMasterSemaphore()}, active_pool{
                                                                              AllocateNewPool()} {}