include: drivers: stm32 dma give the STREAM OFFSET to count channels
include: drivers: stm32 dma give the STREAM OFFSET to count channels

This defines the constant for the STM32_DMA_STREAM_OFFSET
to be 0 or 1 when counting the first DMA channel
depending on the stm32 soc and DMA peripheral version.

Signed-off-by: Francois Ramu <b83adc7f8a23ee911a37fcb61c4033581aae0b7a@st.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr