ARM: OMAP2+: Restore MPU power domain if cpu_cluster_pm_enter() fails

If cpu_cluster_pm_enter() fails, we need to set MPU power domain back
to enabled to prevent the next WFI from potentially triggering an
undesired MPU power domain state change.

We already do this for omap_enter_idle_smp() but are missing it for
omap_enter_idle_coupled().

Fixes: 55be2f5033 ("ARM: OMAP2+: Handle errors for cpu_pm")
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/cpuidle44xx.c

@@ -174,8 +174,10 @@ static int omap_enter_idle_coupled(struct cpuidle_device *dev,
 		 */
 		if (mpuss_can_lose_context) {
 			error = cpu_cluster_pm_enter();
-			if (error)
+			if (error) {
+				omap_set_pwrdm_state(mpu_pd, PWRDM_POWER_ON);
 				goto cpu_cluster_pm_out;
+			}
 		}
 	}