Update dma V1 binding with STM32 macros

[djiatsaf-st]

• Add STM32 macro 15th bit for st,stm32-dma-v1.yaml , necessary for Peripheral Increment Offset Size configuration
• Update st,stm32-dma-v1.yaml description .

This make easy to configure dma peripherals.

[erwango]

Nit: maybe these comments should be moved to stm32_dma.h?

Well, bindings are where all these are supposed to be documented https://docs.zephyrproject.org/latest/build/dts/api/bindings/dma/st%2Cstm32-dma-v1.html#dtbinding-st-stm32-dma-v1

[erwango]

@teburd Up to you (or you can assign it to me)