OMAP4: cpuidle: don't touch mpu and core state until CPU1 is off

MPU/Core logic and PD states shouldn't be changed until CPU1 is
completely off

Change-Id: Ia90126776e7bd7108c7b885c622df36323982cb0
Signed-off-by: Lianwei Wang <lian-wei.wang@motorola.com>
Signed-off-by: suilunlam <a0868997@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>