Rom : Use Linaro 4.8 Toolchain // Use -O3 for Optimization

Change-Id: I2536a57ef644a17a3fb06aeaca420a1fda43f224
Hide more warnings

Change-Id: I6a6b768efa10a1f7419856d98ceefda41c6d4e37
Rom: Use daily linaro build for now

Change-Id: I645e0b5867cd01f0d92ed72888ee505bafe0add6