ARM: SAMSUNG: Gracefully exit on suspend failure

As per the Exynos5250 User Manual:
When there are pending interrupt events, WFI/WFE instruction are
ignored. To cancel the power-down sequence follow these steps:
1) Disable system power-down using CENTRAL_SEQ_CONFIGURATION register
2) Clear WAKEUP_STAT register
3) Enable interrupt service routine for CPU

Code for early wakeup for exynos already exists. Remove the panic
on suspend failure, clear the wakeup state register and return 1
from cpu_suspend to indicate a failed suspend (to a user daemon).

Older Samsung SoCs have similar panics and I have removed them all.
Haven't touched the S3C2410 sleep code.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s5pv210/pm.c

@@ -104,8 +104,8 @@ static int s5pv210_cpu_suspend(unsigned long arg)
 	    "mcr p15, 0, %0, c7, c10, 4\n\t"
 	    "wfi" : : "r" (tmp));
 
-	/* we should never get past here */
-	panic("sleep resumed to originator?");
+	pr_info("Failed to suspend the system\n");
+	return 1; /* Aborting suspend */
 }
 
 static void s5pv210_pm_prepare(void)