drivers: dma: add linked list in dmau5 driver

- Init linked list node and structure
- configure source and destination address
- Setting gpdma request mode
- Configure linked list node and structure for
continous transfer, enable half transfert irq.

Signed-off-by: Fabrice DJIATSA <fabrice.djiatsa-ext@st.com>
co-authored-by: Lubos Koudelka <lubos.koudelka@st.com>