can: tcan4x5x: tcan4x5x_can_probe(): turn on the power before parsing the config

can: tcan4x5x: tcan4x5x_can_probe(): turn on the power before parsing the config

The tcan4x5x_parse_config() function now performs action on the device
either reading or writing and a reset. If the devive has a switchable
power supppy (i.e. regulator is managed) it needs to be turned on.

So turn on the regulator if available. If the parsing fails, turn off
the regulator.

Fixes: c52ad193400d ("can: tcan45x: Make wake-up GPIO an optional GPIO")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>