BREAKING CHANGE: Public STM32L5 interfaces were renamed from stm32l5_* forms
to canonical stm32_* forms across arch and board headers/sources.
Public type names in STM32L5 timer/GPIO/EXTI and related API-facing
declarations were normalized to stm32_* equivalents.
The STM32L5 root family header was renamed from stm32l5.h to stm32.h;
all STM32L5 arch/board includes were updated accordingly.
Signed-off-by: raiden00pl <raiden00@railab.me>