Revert "Revert "Add /sys/kernel/memory_state_time to sysfs_power.""

This reverts commit 12e73685.

Reason for revert: Rolling original change forward again, more carefully.

Change-Id: I266b181915c829d743c6d8d0b8c0d70b6bf3d620

private/genfs_contexts

@@ -114,6 +114,7 @@ genfscon sysfs /power/state u:object_r:sysfs_power:s0
 genfscon sysfs /power/wakeup_count u:object_r:sysfs_power:s0
 genfscon sysfs /power/wake_lock u:object_r:sysfs_wake_lock:s0
 genfscon sysfs /power/wake_unlock u:object_r:sysfs_wake_lock:s0
+genfscon sysfs /kernel/memory_state_time u:object_r:sysfs_power:s0
 genfscon sysfs /kernel/ipv4 u:object_r:sysfs_ipv4:s0
 genfscon sysfs /kernel/notes u:object_r:sysfs_kernel_notes:s0
 genfscon sysfs /kernel/uevent_helper u:object_r:sysfs_usermodehelper:s0