drivers: dma: Update NXP LPC driver for SPI peripheral

1, Change the allocation of DMA descriptors for the case
when multiple buffers are used for DMA transfer. This was
tested during SPI DMA transfers
2. Add support for the case when source and destination
addresses should not be incremented.

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>