Media Codecs, Overlay and service update

i9500.mk - dalvik cache and data optimization
audio - Media codec update
overlay - backlight brightness correction
rootdir - update services

PS2: Clean whitespaces.

Change-Id: I83dcca67258d0b55663dbbc533341d391eab98c1
Signed-off-by: x10f <android.x10f@gmail.com>