Migrate mpq demux and TSPP driver from kernel 4.9 to 4.14

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 as of msm-4.9,
'commit 7b86834562b1ef2b3b466
("Migrate mpq demux driver from kernel 4.4 to 4.9")'.

In addition, introduce a few code changes to fix warnings,
typos and other style issues.

Change-Id: I115c400d2ae46eb7221723af630d4747de3e482d
Signed-off-by: Monika Singh <monising@codeaurora.org>