Set eMutableFormat in Texture Image Creation

We often need to alias the underlying data as multiple Vulkan formats which requires the `eMutableFormat` bit to be set in `VkImageCreateInfo`, without doing this there'll be validation layer errors and potentially GPU bugs.

app/src/main/cpp/skyline/gpu/texture/texture.cpp

@@ -307,6 +307,7 @@ namespace skyline::gpu {
             usage |= vk::ImageUsageFlagBits::eDepthStencilAttachment;
 
         vk::ImageCreateInfo imageCreateInfo{
+            .flags = vk::ImageCreateFlagBits::eMutableFormat,
             .imageType = guest->dimensions.GetType(),
             .format = *guest->format,
             .extent = guest->dimensions,