Kernel: Fix buffer overflow in VirtIOGPU create_3d_resource(..)

This code attempts to copy the `Protocol::Resource3DSpecification`
struct into request, starting at `Protocol::ResourceCreate3D::target`
member of the `Protocol::ResourceCreate3D` struct.

The problem is that the `Protocol::Resource3DSpecification` struct
does not having the trailing `u32 padding` that the `ResourceCreate3D`
struct has. Leading to memcopy overrunning the struct and corrupting
32 bits of data trailing the struct.

Found by SonarCloud:
 - Memory copy function overflows the destination buffer.

Kernel/Graphics/VirtIOGPU/Protocol.h

@@ -328,6 +328,7 @@ struct Resource3DSpecification {
     u32 last_level;
     u32 nr_samples;
     u32 flags;
+    u32 padding;
 };
 
 }