ARM: configs: stm32: Clean STM32 defconfig

ARM: configs: stm32: Clean STM32 defconfig

Running make savedefconfig highlights some useless flags.

Since 54a48aa3d558 ("Compiler Attributes: remove CONFIG_ENABLE_MUST_CHECK")
flag ENABLE_MUST_CHECK has been removed.

Since 35260cf54522 ("Kconfig.debug: fix SCHED_DEBUG dependency")
SCHED_DEBUG depends on DEBUG_KERNEL and PROC_FS.
As PROC_FS is not set, SCHED_DEBUG reference can be removed.

Since 78011042684d ("scsi: bsg: Move bsg_scsi_ops to drivers/scsi/")
BLK_DEV_BSG depends on SCSI. As SCSI is not set, BLK_DEV_BSG reference
can be removed.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241220125506.3157268-3-patrice.chotard@foss.st.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>