uart: Added uart control to zmraa uart Kconfig
uart: Added uart control to zmraa uart Kconfig

Required by some UPM drivers.  Pushing into zmraa.

Signed-off-by: Noel Eck <1e36ab6ededef40f3f16bdbc1b09eee72c5d08cf@intel.com>

jontrulson/zmraa,malikabhi05/zmraa-1,whbruce/zmraa,intel-iot-devkit/zmraa