msm: vidc: Remove forced-setting of layer-wise bitrate for HP

Layerwise bitrate with predefined distribution table is applied
if HP is enabled. This is wrong (since client may configure
custom distribution) and unnecessary (client may not configure
layerwise distribution and use cumulative).

CRs-Fixed: 1023504
Change-Id: I053587ae85b36ce0b08fdb5918c0f6b9d678dd24
Signed-off-by: Praveen Chavan <pchavan@codeaurora.org>