Added UART DMA reception for sylink messages with more then 1byte data #1060
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By using DMA for syslink uart reception we will free up CPU time and reduce jitter. The DMA will be setup after receiving the header+length (3 bytes) and if data length is more than 1. Most messages are many bytes long.
A kbuild define communication->SYSLINK_RX_DMA has also been added with default set to yes. It enables users to go back to interrupt driven receive if this is needed.