init: don't use magic numbers for RLIMIT_ constants.

Also, why are we accepting the completely made-up "RLIM_AS" but not the
real "RLIMIT_AS" in .rc files?

Bug: http://b/293894041
Test: treehugger
Change-Id: I18b10b6dd77265a9a14b88bfdf1cc0b474800a94
2 files changed