arch/soc/st_stm32: Move STM32Cube HAL core funtions

STM32Cube HAL core initialization functions HAL_GetTick()
and HAL_Delay() are implemented in all STM32 series. This
patch moves these functions in file stm32cube_hal.c under
"common" folder to reduce code duplication.

Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>