drivers: dma: dma_nxp_edma: support 64-bit TCD

On some EDMA versions, some TCD registers (e.g: SADDR, DADDR,
SLAST, DLAST, etc...) are extended to 64 bits via adding a new
HIGH register holding the value of bits [63:32]. Since, for now,
the driver doesn't support 64-bit addresses, this scenario is
supported by sign-extending the 32-bit value written to SLAST/DLAST.
SADDR and DADDR are taken care of on HAL side.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>