This patch adds a very simple UART sample application which demonstrates
how to use the UART APIs. This sample is also useful to quickly verify
if a given UART driver is working properly. For now, the application
tests uart_poll_in() and uart_poll_out() APIs only, but new APIs should
be added in future.
Change-Id: If815f358f11efb058e947291b234d3d4130581d8
Signed-off-by: Andre Guedes <andre.guedes@intel.com>
59912cf13f