ANDROID: GKI: Add padding after init_task structure

To reduce static memory allocated in the task_struct to accommodate
vendor data, the move to a dynamically sized task_struct is being made.
As part of this effort, add padding after the init_task structure.
This has to be done because init_task is statically allocated and hence
will not benefit from the dynamic addition of size to all task_structs.

Bug: 233921394
Signed-off-by: Sai Harshini Nimmala <quic_snimmala@quicinc.com>
Change-Id: I737f951d57a5c19ff6474d4243a22f5f9cfbfa8b