init.rc: move rlimit setting earlier

There is no reason that rlimits cannot be set earlier than they are,
and apexd-bootstrap may want to set the priority service option, which
would require that these rlimits have been set, so we move these to
the beginning of early-init.

Bug: 134668377
Test: apexd-bootstrap can set the priorty service option
Change-Id: I8040190cd4dc5e141784496ae65cfab80d9cad53