Input: twl6040-vibra - code cleanup in probe with devm_* conversion

Convert the probe to use devm_*. At the same time reorder the calls
so we will register the input device as the last step when the driver
is loaded.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>