media: dvb: Align recording chunk based on TS packet size

Recording chunk size should be in multiple of TS packet
based on the recording filter's TS packet format.

Change-Id: Ief6ccacb1d33e0b68239cd380b90e1fb6dac5c1a
Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>