Do not use parentheses around a single statement for consistency

Change-Id: I54533863c80933eed8f01de190bb7713f64f6999
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Remove the unnecessary and noisy comments for the serial port info files

Comments are noisy, useless, and can get outdated. The only comments that might
make sense to me the ones where we note future tasks, such as TODO (or FIXME).
The code should document itself.

The serial port files need a separate evaluation since a lot of stuff is
inherited from QtCore in there where the comments should probably be kept for
consistency.

Change-Id: I6c759c7138f64546c2c4e27a039667c556a30db9
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>