mfd: 88pm886: Add GPADC cell

Add a cell for the PMIC's onboard General Purpose ADC.

Acked-by: Karel Balej <balejk@matfyz.cz> # for the PMIC
Signed-off-by: Duje Mihanović <duje@dujemihanovic.xyz>
Link: https://lore.kernel.org/r/20250911-88pm886-gpadc-v4-3-60452710d3a0@dujemihanovic.xyz
Signed-off-by: Lee Jones <lee@kernel.org>

Author: LegoLivesMatter

drivers/mfd/88pm886.c

@@ -35,6 +35,7 @@ static const struct resource pm886_onkey_resources[] = {
 };
 
 static const struct mfd_cell pm886_devs[] = {
+	MFD_CELL_NAME("88pm886-gpadc"),
 	MFD_CELL_RES("88pm886-onkey", pm886_onkey_resources),
 	MFD_CELL_NAME("88pm886-regulator"),
 	MFD_CELL_NAME("88pm886-rtc"),