misc: w2sg0004: Cleanup before upstreaming

- remove DEBUG macro
- convert debug messages to pr_debug
- convert allocation functions to devm_
- ode cleanup (no functional changes)

Signed-off-by: Marek Belisko <marek@goldelico.com>
w2sg004: Get rid of rx_gpio

- remove usage and use common funtion to parse irq
- define gpio147 as input in DT

Signed-off-by: Marek Belisko <marek@goldelico.com>