gpiolib: better debugging printk (not for upstreaming)

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
GTA04 DT: renamed wwan nodes to better describe what they do

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
w2cbw003: renamed structs and functions to correctly represent the w2cbw

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
modem: renamed structs and functions to correctly represent the wwan modem

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>