[vk] Add missing flush per spec

Signed-off-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-on: #2626
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Co-committed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>

src/common/fs/file.cpp

@@ -3,6 +3,7 @@
 
 #include <vector>
 
+#include "common/assert.h"
 #include "common/fs/file.h"
 #include "common/fs/fs.h"
 #ifdef ANDROID

src/common/fs/path_util.cpp

@@ -9,6 +9,7 @@
 #include <sstream>
 #include <unordered_map>
 
+#include "common/assert.h"
 #include "common/fs/fs.h"
 #ifdef ANDROID
 #include "common/fs/fs_android.h"

src/video_core/renderer_vulkan/present/layer.cpp

@@ -280,6 +280,7 @@ void Layer::UpdateRawImage(const Tegra::FramebufferConfig& framebuffer, size_t i
         Tegra::Texture::UnswizzleTexture(
             mapped_span.subspan(image_offset, linear_size), std::span(host_ptr, tiled_size),
             bytes_per_pixel, framebuffer.width, framebuffer.height, 1, block_height_log2, 0);
+        buffer.Flush();  // Ensure host writes are visible before the GPU copy.
     }
 
     const VkBufferImageCopy copy{