[Encode] Set correct height and fix dump for me4xDistortionBuffer

1) Set buffer height parameter for HME kernel for
me4xDistortionBuffer according to the spec.
Previously it was wrong for interlaced content
2) Use field offset value from HME kernel instead
of calculating it for every dump

Change-Id: I7b72c567c99b09b758774dd62854c18464b4c848
8 files changed