ext4_utils: update default conf from e2fsprogs

Build server machines are using a conf file optimized for google
data center. We should use the default version from upstream
e2fsprogs.

Keep reserved_ratio at 1% to get more free space.

Bug: 37361511
Change-Id: I2638df72cfd3b9404981ef227651d38025a8053c
1 file changed