extcon: adc-jack: Document missing struct members

This patch adds kernel-doc comments for the previously undocumented
members `dev` and `wakeup_source` in the struct adc_jack_data in
adc-jack device driver.

Link: https://lore.kernel.org/lkml/20240426100054.61506-1-yang.lee@linux.alibaba.com/


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>