power: supply: rt9471: Use IC status regfield to report real charger status

power: supply: rt9471: Use IC status regfield to report real charger status

Use IC status regfield to rewrite the 'get_staus' function. The original
one cannot cover some special scenario like as charger OTG or JEITA case.

Fixes: 4a1a5f6781d8 ("power: supply: rt9471: Add Richtek RT9471 charger driver")
Reported-by: Lucas Tsai <lucas_tsai@richtek.com>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/67ba92bb4a9c51d9cafadab30b788a3a2c3048e1.1727252762.git.cy_huang@richtek.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>