intel_idle: disable Atom/Lincroft HW C-state auto-demotion

Just as we had to disable auto-demotion for NHM/WSM,
we need to do the same for Atom (Lincroft version).

In particular, auto-demotion will prevent Lincroft
from entering the S0i3 idle power saving state.

https://bugzilla.kernel.org/show_bug.cgi?id=25252

Signed-off-by: Len Brown <len.brown@intel.com>

drivers/idle/intel_idle.c

@@ -345,8 +345,12 @@ static int intel_idle_probe(void)
 		break;
 
 	case 0x1C:	/* 28 - Atom Processor */
+		cpuidle_state_table = atom_cstates;
+		break;
+
 	case 0x26:	/* 38 - Lincroft Atom Processor */
 		cpuidle_state_table = atom_cstates;
+		auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE;
 		break;
 
 	case 0x2A:	/* SNB */