msm: vidc: ensure codec count is in supported session range

Ensure the count of supported encoder and decoder returned
from firmware are within the range of supported sessions

Change-Id: If3eae7bc82dc8302444e2e4104fb6ae3cfbfed5a
Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
Signed-off-by: Vasantha Balla <vballa@codeaurora.org>