SDL_vulkan.h: Remove Tizen compatibility typedefs.

Any app for this system that wants to move to SDL3 will have to adjust to
all the other API changes anyhow, so there's no need to keep these anymore.

Fixes #9678.

include/SDL3/SDL_vulkan.h

@@ -56,9 +56,6 @@ struct VkAllocationCallbacks;
 
 #endif /* !NO_SDL_VULKAN_TYPEDEFS */
 
-typedef VkInstance SDL_vulkanInstance;
-typedef VkSurfaceKHR SDL_vulkanSurface; /* for compatibility with Tizen */
-
 /**
  *  \name Vulkan support functions
  */