Decoder: fix HEVC decoder frame height align to 32.
Decoder: fix HEVC decoder frame height align to 32.

This follows 32 alignments done in MSDK library for HEVC decode.

Fixes #6

Signed-off-by: Lim Siew Hoon <e412356d7e67dbdde94e841e5d46937fb9f4e623@intel.com>

ph0b/gstreamer-media-SDK,rislim/gstreamer-media-SDK,rislim/gstreamer-media-SDK,ishmael1985/gstreamer-media-SDK