DO NOT MERGE limit mediaserver memory

Limit mediaserver using rlimit, to prevent it from bringing down the system
via the low memory killer.
Default max is 65% of total RAM, but can be customized via system property.

Bug: 28471206
Bug: 28615448
Change-Id: I14fac1e12b5f3983be08a21bfbfc54feedbf3f16
5 files changed