system_suspend: reduce logspam

/sys/class/wakeup and /sys/power/suspend_stats are opened when
SystemSuspend starts up. We already log an error if they are not present
at that point, so no need to log errors after that.

Fixes: 145746402
Test: "dumpsys suspend_control" still works
Change-Id: Ie9c9291446d43789c263bc0d232acc8bda14c5aa
2 files changed