pwm: rockchip: fix lock warning

pwm: rockchip: fix lock warning

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0 #43
[<c00142ec>] (unwind_backtrace+0x0/0xe0) from [<c0011c08>] (show_stack+0x10/0x14)
[<c0011c08>] (show_stack+0x10/0x14) from [<c007e018>] (__lock_acquire.isra.24+0x1a4/0x7a4)
[<c007e018>] (__lock_acquire.isra.24+0x1a4/0x7a4) from [<c007ebd0>] (lock_acquire+0x120/0x144)
[<c007ebd0>] (lock_acquire+0x120/0x144) from [<c0717f84>] (_raw_spin_lock_irqsave+0x4c/0x60)
[<c0717f84>] (_raw_spin_lock_irqsave+0x4c/0x60) from [<c0288750>] (rk_pwm_config_v2+0xd4/0x15c)
[<c0288750>] (rk_pwm_config_v2+0xd4/0x15c) from [<c0288b98>] (rk_pwm_config+0x60/0x74)