rootdir: init.rc: use gc_urgent_sleep_time for f2fs

This accelerates f2fs GC when IdleMaint.

Bug: 128594671
Bug: 137190790
Change-Id: I1cea7c99ffd5963711c66460f1c8368b43aeaee2
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index c042c48..2f4ab10 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -679,6 +679,7 @@
     # to make it too large, since it may bring userdata loss, if they
     # are not aware of using fsync()/sync() to prepare sudden power-cut.
     write /sys/fs/f2fs/${dev.mnt.blk.data}/cp_interval 200
+    write /sys/fs/f2fs/${dev.mnt.blk.data}/gc_urgent_sleep_time 50
 
     # Permissions for System Server and daemons.
     chown radio system /sys/android_power/state