ARM: stm32: use "depends on" instead of "if" after prompt

This appeared after the global fixups by commit e32465429490 ("ARM: use
"depends on" for SoC configs instead of "if" after prompt"). Fix it now.

Link: https://lore.kernel.org/r/[e-mail]
Fixes: e32465429490 ("ARM: use "depends on" for SoC configs instead of "if" after prompt")
Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Olof Johansson <[e-mail]>

arch/arm/mach-stm32/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_STM32
-	bool "STMicroelectronics STM32 family" if ARM_SINGLE_ARMV7M || ARCH_MULTI_V7
+	bool "STMicroelectronics STM32 family"
+	depends on ARM_SINGLE_ARMV7M || ARCH_MULTI_V7
 	select ARMV7M_SYSTICK if ARM_SINGLE_ARMV7M
 	select HAVE_ARM_ARCH_TIMER if ARCH_MULTI_V7
 	select ARM_GIC if ARCH_MULTI_V7