msm: vidc: fix to pass correct buffer count to fw

Remove msm_vidc_calculate_output_buffer_count function
calls while g_ctrl event to avoid overwriting of
buffer count to old buffer count value that is set by
client.

Change-Id: I76135a88948ad7e2845c054a48e9f148bf367abb
Signed-off-by: Akshata Sahukar <asahukar@codeaurora.org>