ext: hal: Enable support for stm32mp1xx hal

Provide required changes to stm32cube HAL and LL for the
STM32MP1X series MCU.

Origin: ST Microelectronics
License: BSD-3-Clause
URL: https://github.com/STMicroelectronics/STM32CubeMP1


Commit: 1.1.0
Purpose: HAL layer for STM32MP1
Maintained-by: External

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>