The chip needs to be powered up before calling tsc200x_stop_scan() which
communicates with it; move the call to enable the regulator earlier in
tsc200x_probe().

At the same time switch to using devm_regulator_get_enable() to simplify
error handling. This also makes sure that regulator is not shut off too
early when unbinding the driver.

Link: https://lore.kernel.org/r/20240711172719.1248373-1-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>