When DEBUG_OBJECTS config is enabled, we get the below odebug warnings:

ODEBUG: object is on stack, but not annotated

WARNING: CPU: 3 PID: 1304 at kernel/lib/debugobjects.c:300 __debug_object_init+0x1f0/0x458
CPU: 3 PID: 1304 Comm: psci_suspend_te Tainted: G W 4.9.0-06564-gf80f3f199260 #284
task: ffffe9e1b55a1600 task.stack: ffffe9e1b51c0000
PC is at __debug_object_init+0x1f0/0x458
LR is at __debug_object_init+0x1ec/0x458
Call trace:
 __debug_object_init+0x1f0/0x458
 debug_object_activate+0x150/0x260
 mod_timer+0xb4/0x4c0
 suspend_test_thread+0x1cc/0x3c0
 kthread+0x110/0x140
 ret_from_fork+0x10/0x40

This patch annotates the timer on the stack using setup_timer_on_stack
function to remove the above warnings.

Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>