arm64: STM32: drop an undefined Kconfig symbol

Drop ARM_SMC_MBOX since it is not defined or used anywhere else
in the kernel source tree.

Fixes: 9e4e24414c ("arm64: introduce STM32 family on Armv8 architecture")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20251230181429.3429404-1-rdunlap@infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
This commit is contained in:
Randy Dunlap 2025-12-30 10:14:29 -08:00 • committed by Alexandre Torgue
commit 7006477e7f