* Diff reduction between ADNS9800 and PMW3360 drivers.
They are very similar devices. This (somewhat) unreadable diff is
essentially a no-op, but it makes a `vimdiff` between the 2 drivers much
more readable.
* Cleanup pwm3360 driver some more.
Remove redundant calls to spi_start() and spi_stop(), as pmw3360_write()
will already call these.
Timing does not match Pixart documentation for this sensor (may have been carried forward from adns9800).
Not aware of any issues coming from this currently.
It should only cause issues when writing to multiple registers in succession which currently only happens during initialization for the PMW3360.
This should prevent future issues with write operations if other features of the sensor are added.