Neon optimized implementation of S16_opaque_D32_nofilter_DX

This patch does the following:
* Neon ASM blitter from RGB565 to ABGR8888 without blend.
* Special case for no scaling but the scaling case is almost as fast.

 Copyright (C) ST-Ericsson SA 2010

Change-Id: I0fae80b14aa5a5c7f6ff4c251bc1419ffa0d4751
Signed-off-by: Christian Bejram <christian.bejram@stericsson.com>