The Sam3x HAL defines __NVIC_PRIO_BITS to 4.
Fixes an issue where interrupt priorities and masking
were not being done correctly.
Issue: ZEP-2243
Signed-off-by: Andrew Boie <andrew.p.boie@intel.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>