re-scaled 2nd order haar transform

During the work of extend_qrange, we have rolled a factor of 2 from
quantization/dequatnization into 2nd order walsh-hadamard transform.
This commit does the same for the 2nd order haar transform. so they
can share the same quantizaiton process as the 2nd order WHT.

Change-Id: I734af4a20ea8149a01b5b1971a065092977dfe33