media: dvb: Add support for section insertion

TS buffers insertion is required by some applications to
insert modified tables into recorded stream in order to
describe the content of the recording.

Change-Id: Ib7ba3007efb30817c7ee13c2c1d284381eacbf59
Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>