regulator: sm5703: Remove because it is unused and fails to build

This file does not compile because <linux/mfd/sm5703.h> is missing.
In KConfig, it depends on MFD_SM5703.

Both MFD_SM5703 and the missing include rely on another patch that never
got merged. The last iteration related to this patch is [1].

So remove this dead-code and undo commit e8858ba ("regulator:
sm5703-regulator: Add regulators support for SM5703 MFD")

[1]: https://lore.kernel.org/lkml/20220423085319.483524-5-markuss.broks@gmail.com/

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://patch.msgid.link/0f5da91a05e7343d290c88e3c583b674cf6219ac.1725910247.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: tititiou36

drivers/regulator/Kconfig

@@ -1373,13 +1373,6 @@ config REGULATOR_SLG51000
 	  The SLG51000 is seven compact and customizable low dropout
 	  regulators.
 
-config REGULATOR_SM5703
-	tristate "Silicon Mitus SM5703 regulators"
-	depends on MFD_SM5703
-	help
-	  This driver provides support for voltage regulators of SM5703
-	  multi-function device.
-
 config REGULATOR_STM32_BOOSTER
 	tristate "STMicroelectronics STM32 BOOSTER"
 	depends on ARCH_STM32 || COMPILE_TEST

drivers/regulator/Makefile

@@ -160,7 +160,6 @@ obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_REGULATOR_SC2731) += sc2731-regulator.o
 obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
 obj-$(CONFIG_REGULATOR_SLG51000) += slg51000-regulator.o
-obj-$(CONFIG_REGULATOR_SM5703) += sm5703-regulator.o
 obj-$(CONFIG_REGULATOR_STM32_BOOSTER) += stm32-booster.o
 obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
 obj-$(CONFIG_REGULATOR_STM32_PWR) += stm32-pwr.o