backlight: pcf50633-backlight: 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/20250311014959.743322-8-linux@treblig.org
Signed-off-by: Lee Jones <lee@kernel.org>

Author: Dr. David Alan Gilbert

drivers/video/backlight/Kconfig

@@ -370,13 +370,6 @@ config BACKLIGHT_88PM860X
 	help
 	  Say Y to enable the backlight driver for Marvell 88PM8606.
 
-config BACKLIGHT_PCF50633
-	tristate "Backlight driver for NXP PCF50633 MFD"
-	depends on MFD_PCF50633
-	help
-	  If you have a backlight driven by a NXP PCF50633 MFD, say Y here to
-	  enable its driver.
-
 config BACKLIGHT_AAT2870
 	tristate "AnalogicTech AAT2870 Backlight"
 	depends on MFD_AAT2870_CORE

drivers/video/backlight/Makefile

@@ -50,7 +50,6 @@ obj-$(CONFIG_BACKLIGHT_MP3309C)		+= mp3309c.o
 obj-$(CONFIG_BACKLIGHT_MT6370)		+= mt6370-backlight.o
 obj-$(CONFIG_BACKLIGHT_OMAP1)		+= omap1_bl.o
 obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
-obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_QCOM_WLED)	+= qcom-wled.o
 obj-$(CONFIG_BACKLIGHT_RT4831)		+= rt4831-backlight.o

drivers/video/backlight/pcf50633-backlight.c

@@ -15,7 +15,6 @@
 #include <linux/regulator/machine.h>
 #include <linux/pm.h>
 #include <linux/power_supply.h>
-#include <linux/mfd/pcf50633/backlight.h>
 
 struct pcf50633;
 struct regmap;
@@ -42,8 +41,6 @@ struct pcf50633_platform_data {
 	void (*force_shutdown)(struct pcf50633 *);
 
 	u8 resumers[5];
-
-	struct pcf50633_bl_platform_data *backlight_data;
 };
 
 struct pcf50633_irq {