msm: vidc: update dpb buffer requirements

buffer counts(min_cnt, min_host, actual_cnt) is updated in
hal_buffer_requirements only for internal buffers. Currently
for dpb, we are updating only actual_cnt, due to that
msm_vidc_verify_buffer_counts check is failing. So updated
all 3 variables(min_cnt, min_host, actual) for dpb.

Change-Id: Ib6e476fae57407a2b5fb55b1b73986dfca410ae6
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>