vmlinux.lds.h: Remove entry to place init_task onto init_stack

Since commit 0eb5085 ("arch: remove ARCH_TASK_STRUCT_ON_STACK")
there is no option that would allow placing task_struct on the stack.
Remove the unused linker script entry.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241217202745.1402932-2-benjamin@sipsolutions.net

include/asm-generic/vmlinux.lds.h

@@ -404,7 +404,6 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
 	__start_init_stack = .;						\
 	init_thread_union = .;						\
 	init_stack = .;							\
-	KEEP(*(.data..init_task))					\
 	KEEP(*(.data..init_thread_info))				\
 	. = __start_init_stack + THREAD_SIZE;				\
 	__end_init_stack = .;