[MIPS] Added missing _NR_* system call support and cleaned up.

Change-Id: I18499a73ad3732a16edb941c4db9fc2811dfe5d5
Signed-off-by: Pete Delaney <piet.delaney@imgtec.com>
Signed-off-by: Chris Dearman <chris.dearman@imgtec.com>
Signed-off-by: Paul Lind <paul.lind@imgtec.com>
5 files changed