x86/callthunks: Delete unused "struct thunk_desc"

It looks like it was never used.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/843bf596-db67-4b33-a865-2bae4a4418e5@p183

arch/x86/kernel/callthunks.c

@@ -48,11 +48,6 @@ EXPORT_SYMBOL_GPL(__x86_call_count);
 
 extern s32 __call_sites[], __call_sites_end[];
 
-struct thunk_desc {
-	void		*template;
-	unsigned int	template_size;
-};
-
 struct core_text {
 	unsigned long	base;
 	unsigned long	end;