Port STM32F7 I2C to STM32F3 and STM32F0L0
arch/arm/src/stm32: port I2C IPv2 driver from F7 (only F3 chips)
arch/arm/src/stm32f0l0: port I2C IPv2 driver from F7
configs/b-l072z-lrwan1: nxlines_oled example (ssd1306)
configs/b-l072z-lrwan1: support for the I2C tool
configs/nucleo-f303ze: nxlines_oled example (ssd1306)
arch/arm/src/stm32h7/chip.h: cosmetics
arch/arm/src/stm32/chip/stm32_tim.h: cosmetics
Approved-by: Gregory Nutt <gnutt@nuttx.org>
stm32h7
stm32h7: compile with stm32_rcc.c
stm32h7: some PWR definitions
stm32h7: add some RCC defs and change some code style to be more like in other STM ports
stm32h7: basic clocks configuration
Approved-by: GregoryN <gnutt@nuttx.org>
