dts/arm/st: Split "st,stm32-dma" compatible into -v1 and -v2

2 versions of DMA hardware blocks could be found across stm32 series.
In order to simplify the handling of matching Kconfig symbols,
make this visible in dts files by creating "st,stm32-dma-v1" and
"st,stm32-dma-v2" and set them accordingly in dtsi files.

Duplicate and update related bindings to reflect that new state.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>