msm: vidc: venc: Layer ID update for bitrate

Update layer ID for bitrate setting. There was a bug
which missed updating layer ID.

CRs-Fixed: 2039941
Change-Id: I884c3d6edae68745da1b08118f9f188ea6650370
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>