media: dvb: mpq: Set smaller descriptor size for section pipe

Section and PES/recording pipes had same descriptor sizes,
notification rate from BAM for both types was the same. Since
sections are lower-bitrate than PES/recording data, the descriptor
size for sections pipe was reduced to allow better responsiveness
to this kind of data.

Change-Id: I8b99a1b4c38bb9a9fdfa8d3fb4d1864b133d954a
Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>
Signed-off-by: Neha Pandey <nehap@codeaurora.org>