serial: Add UART port for EUD

This commit adds new UART port to support UART available on Embedded
USB Debugger (EUD).

Change-Id: Ib2bcf15df04875e5d9eb7ce3dc30f1d187236279
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>