abox_edge: Updated u-boot, audio and wifi binaries

Updates:
- uboot.bin is updated to remove 3s stall during bootup
- removed dependency on libxml2.so
- remove audio binary and moved to source
- updated libacm.so
- added wifi calibration binaries

BUG=25751258
BUG=25592980

Change-Id: Ic5e6a3719e0d94df4d5ccbc63dce074d70cc9544