BREAKING CHANGE: Public STM32L4 interfaces were renamed from stm32l4_* forms to
canonical stm32_* forms across arch and board headers/sources.
Public type names were normalized to stm32_*
equivalents (including timer/lptimer/dma/freerun API-facing types), and
stm32l4can_initialize() was renamed to stm32_caninitialize().
The STM32L4 root family header was renamed from stm32l4.h to stm32.h;
all STM32L4 arch/board includes were updated accordingly.
Signed-off-by: raiden00pl <raiden00@railab.me>