disable powerhint for F2FS gc_urgent mode

Disable the powerhint for F2FS gc_urgent mode, since we are going to
replace this with the smart idle maintenance service.

Test: turn on/off the screen & check /sys/fs/f2fs/dm-*/gc_urgent
Bug: 214430685
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Change-Id: I6acf8e9e8a8d7e33d89acb1be44ea340e3f02241
4 files changed