rk: proc: fix slub warning when call setup_irq

rk: proc: fix slub warning when call setup_irq

BUG: sleeping function called from invalid context at mm/slub.c:926
in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: swapper/3
INFO: lockdep is turned off.
irq event stamp: 45900
hardirqs last  enabled at (45899): [<c009fe18>] rcu_preempt_note_context_switch+0x174/0x18c
hardirqs last disabled at (45900): [<c0605a64>] _raw_spin_lock_irq+0x18/0x50
softirqs last  enabled at (45744): [<c002c424>] irq_enter+0x50/0x78
softirqs last disabled at (45743): [<c002c418>] irq_enter+0x44/0x78
CPU: 3 PID: 0 Comm: swapper/3 Tainted: G           O 3.10.0 #405
[<c0013fe8>] (unwind_backtrace+0x0/0xe0) from [<c0011930>] (show_stack+0x10/0x14)
[<c0011930>] (show_stack+0x10/0x14) from [<c00fa3dc>] (__kmalloc+0x70/0x228)
[<c00fa3dc>] (__kmalloc+0x70/0x228) from [<c0148d2c>] (__proc_create+0x94/0xf0)
[<c0148d2c>] (__proc_create+0x94/0xf0) from [<c0149000>] (proc_mkdir_data+0x30/0x74)
[<c0149000>] (proc_mkdir_data+0x30/0x74) from [<c009babc>] (register_handler_proc+0xe8/0x114)
[<c009babc>] (register_handler_proc+0xe8/0x114) from [<c00982b0>] (__setup_irq+0x334/0x3fc)
[<c00982b0>] (__setup_irq+0x334/0x3fc) from [<c0098558>] (setup_irq+0x58/0x80)
[<c0098558>] (setup_irq+0x58/0x80) from [<c05ef51c>] (rk_timer_init_clockevent+0x98/0xcc)
[<c05ef51c>] (rk_timer_init_clockevent+0x98/0xcc) from [<c05ed0dc>] (percpu_timer_setup+0x54/0xa8)
[<c05ed0dc>] (percpu_timer_setup+0x54/0xa8) from [<c05ed4d8>] (secondary_start_kernel+0x128/0x160)
[<c05ed4d8>] (secondary_start_kernel+0x128/0x160) from [<600081bc>] (0x600081bc)