Revert "msm: vidc: Confirgure work mode 2 based on rate control"

This reverts commit d65483ef.
Original change enables B-Frames which has issues in error
concealment in VT applications in packet loss scenarios.
Hence revert the change.

CRs-Fixed: 2346555
Change-Id: I62cadbc46ded5a2594460b2d5d7bac4b038a500d
Signed-off-by: Manikanta Kanamarlapudi <kmanikan@codeaurora.org>