pwm: bcm2835: Drop write-only member of driver private data
Since commit fcc760729359 ("pwm: bcm2835: Allow PWM driver to be used in
atomic context") struct bcm2835_pwm::dev is only assigned a value, but
it's never used. So the dev member can just be dropped.
Link: https://lore.kernel.org/r/20240129081029.2355612-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>