The SAM4S, SAM3X, SAME70 all use the uart_sam.c serial
driver. This patch puts the configuration in DTS and
out of Kconfig. The SAME70 uses the USART as well.
USART DTS support for the SAME70 is also in this patch.
Signed-off-by: Justin Watson <jwatson5@gmail.com>
Now that we can utilize label in the device tree we can convert to
getting the device name for the Atmel SAM3 UART out of the device
tree instead of from Kconfig.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>