ENGR00287826 mxc: mlb: Fix MLB rcu stall issue when MITB is not set correctly

ENGR00287826 mxc: mlb: Fix MLB rcu stall issue when MITB is not set correctly

MLB lock and clock check has logic issue in code. The timeout cann't work and
it will cause rcu-stall.

Exception stack(0xdca21e68 to 0xdca21eb0)
1e60:                   00000001 00000000 ffffff7f 0000270f 00002710 0000ffc0
1e80: 00000000 00000004 00000002 00000001 00000001 7f003b50 f0378000 dca21eb0
1ea0: 7f003b50 7f0009cc 20000013 ffffffff
[<8000dc04>] (__irq_svc+0x44/0x58) from [<7f0009cc>] (mlb150_dev_unmute_syn_ch
[<7f0009cc>] (mlb150_dev_unmute_syn_ch+0x34/0xd4 [mxc_mlb150]) from [<7f002584
[<7f002584>] (mxc_mlb150_ioctl+0x85c/0x898 [mxc_mlb150]) from [<800db86c>] (do_
[<800db86c>] (do_vfs_ioctl+0x40c/0x5e4) from [<800dba7c>] (SyS_ioctl+0x38/0x64)
[<800dba7c>] (SyS_ioctl+0x38/0x64) from [<8000e000>] (ret_fast_syscall+0x0/0x48
INFO: rcu_sched self-detected stall on CPU
        0: (14684 ticks this GP) idle=fdf/140000000000001/0 softirq=1555/1555
         (t=14720 jiffies g=2 c=1 q=22)
CPU: 0 PID: 628 Comm: mxc_mlb150_test Not tainted 3.10.17-16837-g187ed79-dirty
[<80013d7c>] (unwind_backtrace+0x0/0xf4) from [<80011798>] (show_stack+0x10/0x
[<80011798>] (show_stack+0x10/0x14) from [<8008575c>] (rcu_check_callbacks+0x3
[<8008575c>] (rcu_check_callbacks+0x3d0/0x7f8) from [<80033884>] (update_proce
[<80033884>] (update_process_times+0x40/0x6c) from [<80064f48>] (tick_sched_ti
[<80064f48>] (tick_sched_timer+0x4c/0x78) from [<80048508>] (__run_hrtimer.isr
[<80048508>] (__run_hrtimer.isra.32+0x44/0xd4) from [<80048de4>] (hrtimer_inte
[<80048de4>] (hrtimer_interrupt+0x108/0x294) from [<800136f0>] (twd_handler+0x
[<800136f0>] (twd_handler+0x34/0x44) from [<80080208>] (handle_percpu_devid_ir
[<80080208>] (handle_percpu_devid_irq+0x6c/0x84) from [<8007c958>] (generic_ha
[<8007c958>] (generic_handle_irq+0x2c/0x3c) from [<8000e908>] (handle_IRQ+0x40
[<8000e908>] (handle_IRQ+0x40/0x90) from [<8000856c>] (gic_handle_irq+0x2c/0x5
[<8000856c>] (gic_handle_irq+0x2c/0x5c) from [<8000dc04>] (__irq_svc+0x44/0x5.

Signed-off-by: Luwei Zhou <b45643@freescale.com>