msm: vidc: enable bitrate savings for 8-bit & 10-bit

Currently bitrate savings enable is a boolean value. So
changing that to integer.

0 -> disable bitrate savings
1 -> only for 8-bit
2 -> only for 10-bit
3 -> both 8-bit & 10-bit.

Change-Id: I495eff0cc6144530e8ac8641ce3eca12a97547cc
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>