dont copy init.usb.rc
build: Relax Cortex CFLAGS

 * Always set march=armv7-a
 * Use mtune instead of mcpu. Bad code is generated on A15 otherwise.

Change-Id: Idf8ced8eb0e9d3d4676ca8ec69bf56aed5533bf4
eat: Use /cache if possible

 * Check the size of /cache and use it if possible.

Change-Id: I72fecf3f8d2311c04e63fe81a7ca9a8a6a40419d
fix path to sounds in sdk product

This is necessary to build the SDK:

    lunch sdk-eng && make sdk

Change-Id: I7b9dcfc418ddc46e2967b627525d042bbf6334e1
mkvendor.sh: force armeabi-v7a

Change-Id: I9f29eec73a13144b47ff7b1db1d59cb1e5a4ef64
dont build home