Clean up discard_max_bytes call

This is handled by AOSP init.rc already, see
system/core/rootdir/init.rc. Also, the sysfs path here is outdated and
doesn't exist anymore.

Issue: FP3-A13#114
Change-Id: I75c0b8d241ecde26e16aab4dc99f232d36047b51
1 file changed