Revert "msm: vidc: Decrease the size of decoder compressed buffer"

For some codecs like VP8 the compression is not high. So the
compressed stream length could be more than 1/4th of the size
of the uncompressed stream. This change sets the size of the
compressed stream to to half of the uncompressed stream.

This reverts commit 2d72071c8759589048094adbbdc302591532ac74.

CRs-Fixed: 525713
Change-Id: I103d862c41e9dd8c4971870c5bb82a93bd0c073b
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>