Add some I2C devices to nucleo-h743zi and a few small fixes
configs/nucleo-h743zi: add support for ssd1306
configs/nucleo-h743zi: add support for pca9635
configs/nucleo-h743zi: add support for i2ctools
include/nuttx/sensors/lsm6dsl.h: remove whitespaces
configs/stm32f103-minimum/src/stm32_ssd1306.c: cosmetics
Documentation/NuttxPortingGuide.html: vsyslog return none
drivers/syslog/README.txt: vsyslog return none
Approved-by: Gregory Nutt <gnutt@nuttx.org>
