Update meta-allwinner to new location

Change-Id: If9b7469fd4db743012d7e8a89fdb01ea2d79bba5
Signed-off-by: Khem Raj <raj.khem@gmail.com>

Conflicts:
	default.xml
Rename meta-allwinner -> meta-sunxi

Change-Id: I6ecea624f90b53d6097886c87170fa57754d27d6
Signed-off-by: Khem Raj <raj.khem@gmail.com>