mfd: pcf50633-adc: Remove unused driver

The pcf50633 was used as part of the OpenMoko devices but
the support for its main chip was recently removed in:
commit 61b7f89 ("ARM: s3c: remove all s3c24xx support")

See https://lore.kernel.org/all/Z8z236h4B5A6Ki3D@gallifrey/

Remove it.

Signed-off-by: "Dr. David Alan Gilbert" <linux@treblig.org>
Link: https://lore.kernel.org/r/20250311014959.743322-2-linux@treblig.org
Signed-off-by: Lee Jones <lee@kernel.org>

Author: Dr. David Alan Gilbert

arch/mips/configs/ip27_defconfig

@@ -256,7 +256,6 @@ CONFIG_I2C_STUB=m
 # CONFIG_HWMON is not set
 CONFIG_THERMAL=y
 CONFIG_MFD_PCF50633=m
-CONFIG_PCF50633_ADC=m
 CONFIG_PCF50633_GPIO=m
 # CONFIG_VGA_ARB is not set
 CONFIG_LEDS_LP3944=m

drivers/mfd/Kconfig

@@ -1142,13 +1142,6 @@ config MFD_PCF50633
 	  facilities, and registers devices for the various functions
 	  so that function-specific drivers can bind to them.
 
-config PCF50633_ADC
-	tristate "NXP PCF50633 ADC"
-	depends on MFD_PCF50633
-	help
-	  Say yes here if you want to include support for ADC in the
-	  NXP PCF50633 chip.
-
 config PCF50633_GPIO
 	tristate "NXP PCF50633 GPIO"
 	depends on MFD_PCF50633

drivers/mfd/Makefile

@@ -185,7 +185,6 @@ obj-$(CONFIG_MFD_MT6397)	+= mt6397.o
 
 pcf50633-objs			:= pcf50633-core.o pcf50633-irq.o
 obj-$(CONFIG_MFD_PCF50633)	+= pcf50633.o
-obj-$(CONFIG_PCF50633_ADC)	+= pcf50633-adc.o
 obj-$(CONFIG_PCF50633_GPIO)	+= pcf50633-gpio.o
 obj-$(CONFIG_RZ_MTU3)		+= rz-mtu3.o
 obj-$(CONFIG_ABX500_CORE)	+= abx500-core.o