msm: vidc: Fix criteria for hybrid hierp enablement

If client doesn't request hybrid hierp or sets zero as max
enhancement layer count, then, hybrid hierp is not enabled.

Change-Id: I4284fd5c25d4dc812dac3e134ab5dfc53833bfbf
Signed-off-by: Amit Shekhar <ashekhar@codeaurora.org>