platform: stm: update rst documentation for multi platform
This patch updates rst documentation for manage multi platform.
-stm index lists SOC and Board supported by stmicroelectronics
-Soc documentation are defined in stm/common/<SOC> directory
-Board documentation are defined in stm/<Board> directory
The content of stm/readme.rst file is splited to:
-common/stm32l5xx/readme.rst => Soc
-nucleo_l552ze_q/readme.rst => Board
-stm32l562e_dk/readme.rst => Board
Change-Id: Id2d29281ad6054a8a9305893c2c82466b89a9167
Signed-off-by: Ludovic Barre <ludovic.barre@foss.st.com>
6 files changed