msm: vidc: Add hierp max control and fix hierp encode

Hierp encoding needs max layer count details. Hence, adding support
for max layer count. Also, enabling hybrid hierp along with normal
hierp encoding.

Change-Id: I89eda99735768ae3c80464c95957e4a5adb5bb8e
Signed-off-by: Amit Shekhar <ashekhar@codeaurora.org>