power: supply: axp20x_usb_power: fix spelling mistake

Fix typo: "triger" --> "trigger"

Signed-off-by: Keyur Patel <iamkeyur96@gmail.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>