drm/ssd130x: Print the PWM's label instead of its number

struct pwm_device::pwm is a write-only variable in the pwm core and used
nowhere apart from this and another dev_dbg. So it isn't useful to
identify the used PWM. Emit the PWM's label instead in the debug
message.

Signed-off-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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