media/dvb: Migrate mpq demux and TSPP driver from kernel 4.14 to 4.19

This change migrates all the relevant files consisting of the mpq
demux driver, its plugins, including the addition of TSPPv1 HW driver.
The snapshot is taken from msm-4.14:
'commit 745112 ("Migrate mpq demux driver from kernel 4.9 to 4.14")'.
In addition, introduce a few code changes to fix warnings,
typos and other style issues.

Change-Id: I2cfbf2af4f55e9327bebd10a27e390a692c6f368
Signed-off-by: Murthy Nidadavolu <mnssr@codeaurora.org>