stmhal: Add HALCOMMITS file with list of commits that touch the hal.

This file should be kept up to date with list of hal commits.

stmhal/hal/HALCOMMITS

+This is a list of all commits that relate to the ST Cube HAL, including
+additions, modifications and deletions.  Any commit which touches the HAL
+should be separate from any other changes and should be listed here, most
+recent commit at the top of the list.  This makes it easier to upgrade to
+a new HAL version.
+
+7a55c1a88473d36d4a907c1a2e33967a6c38d157
+stmhal: Port of f4 hal commit 1d7fb82 to f7 hal
+
+28e51c9eb1f633bb4f0a17e964ef7791d54c913d
+stmhal: Port of f4 hal commit 09de030 to f7 hal
+
+af9d885f8cbbe454a8bf655a08c33c775c4838dd
+stmhal: Port of f4 hal commit c568a2b to f7 hal
+
+f243851ccdbb686508f37a573e3ba46da5fffa0c
+stmhal: Expose uwTick in f7 hal.
+
+7c934ae5019d285b58cec3d1edcbc44d90fa6295
+stmhal: Add hal and cmsis files from STM32Cube_FW_F7_V1.1.0.
+
+99a21dc05d7c7e42131264259f287c84afe86200
+stmhal: Add stm32fxxx_hal_i2s_ex.c to hal/f2 (dummy) and hal/f4.
+
+0621eca05ecaf012d0e69bebb0f0fc90719ce9e5
+stmhal: Add STM32CubeF2 version 1.1.0, in hal/f2 directory.
+
+e4d43401eb098d3bfb4e9074e15b67fd86aaffe3
+stmhal: Move HAL Cube files to f4/ subdir, keeping only those we use.
+
+c568a2b44387bee14ea5f427a6e9b736eb1b5345
+stmhal: Adjust computation of SYSCLK to retain precision.
+
+1d7fb82f0aec11331635532583617d773888b991
+stmhal: Change 64-bit arithmetic to 32-bit for SD card block addressing.
+
+09de030651b95956eb9f899e850f24d0ce804460
+stmhal/hal/src/stm32f4xx_hal_sd.c: fix SDHC card capacity
+
+34e43c7ee9700249dc6e5b333b7c264d45d6b530
+stmhal: Improve efficiency of SysTick IRQ and HAL_Delay.
+     
+3ef911345c94a6d612ab50c1e912e81cb2cc3f71
+stmhal: Update STM32Cube F4 HAL driver to V1.3.0.
+
+d689430e790bfbd40a4fc3139b118aee5576baf7
+stmhal: Add SPI class.
+
+9db719bb57626d72ab84ab0ccd2294bf89158762
+stmhal - More systick cleanup. Fix HAL_Delay
+
+dd38d907244bc0e483c3d760f2ba464a394ec229
+Initial checkin with STM HAL