lib: Update stm32f1 code to version 1.8.0

Update the stm32f1 code to the latest from ST.  Merge the
lib/cmsis-stm32f1/ and lib/hal-stm32f1/ into a single lib/stm32f1/
directory.  Document all the differences from the pristine upstream
code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

lib/stm32f1/hal/source/stm32f1xx_ll_pwr.c

@@ -0,0 +1,86 @@
+/**
+  ******************************************************************************
+  * @file    stm32f1xx_ll_pwr.c
+  * @author  MCD Application Team
+  * @brief   PWR LL module driver.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+#if defined(USE_FULL_LL_DRIVER)
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f1xx_ll_pwr.h"
+#include "stm32f1xx_ll_bus.h"
+
+/** @addtogroup STM32F1xx_LL_Driver
+  * @{
+  */
+
+#if defined(PWR)
+
+/** @defgroup PWR_LL PWR
+  * @{
+  */
+
+/* Private types -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private constants ---------------------------------------------------------*/
+/* Private macros ------------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+
+/* Exported functions --------------------------------------------------------*/
+/** @addtogroup PWR_LL_Exported_Functions
+  * @{
+  */
+
+/** @addtogroup PWR_LL_EF_Init
+  * @{
+  */
+
+/**
+  * @brief  De-initialize the PWR registers to their default reset values.
+  * @retval An ErrorStatus enumeration value:
+  *          - SUCCESS: PWR registers are de-initialized
+  *          - ERROR: not applicable
+  */
+ErrorStatus LL_PWR_DeInit(void)
+{
+  /* Force reset of PWR clock */
+  LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_PWR);
+
+  /* Release reset of PWR clock */
+  LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_PWR);
+
+  return SUCCESS;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+#endif /* defined(PWR) */
+/**
+  * @}
+  */
+
+#endif /* USE_FULL_LL_DRIVER */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/