msm: vidc: Align buffer size calculators with num_vpp_pipes

Buffer size calculators are dependent on pipe configuration
of the chipset. Ex: Kona has 4 pipes and lagoon has 1 pipe.
Hence aligning the buffer size calculators based on chipset
specific usage of pipes.

Change-Id: I8bb19efc4a80c7e17d9db3cf7d5f1151191b502e
Signed-off-by: Priyanka Gujjula <pgujjula@codeaurora.org>