arm: add (default) config for nanopi2 board

Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- Configuration changed, mainly several "CONFIG_..." moved from
  s5p4418_nanopi2.h to s5p4418_nanopi2_defconfig and USB related
  configs removed because USB is not supported yet.
- s5p4418_nanopi2.h: "CONFIG_" removed from several s5p4418/nanopi2
  specific defines because the appropriate values do not need to be
  configurable.
- pinctrl is supported now, therefore "CONFIG_PINCTRL=y" added to
  s5p4418_nanopi2_defconfig.

Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
diff --git a/MAINTAINERS b/MAINTAINERS
index d4cef2f..eac3832 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -280,6 +280,23 @@
 F:	board/atmel/
 F:	drivers/misc/microchip_flexcom.c
 
+ARM NEXELL S5P4418
+M:	Stefan Bosch <stefan_b@posteo.net>
+S:	Maintained
+F:	arch/arm/cpu/armv7/s5p4418/
+F:	arch/arm/dts/s5p4418*
+F:	arch/arm/mach-nexell/
+F:	board/friendlyarm/
+F:	configs/s5p4418_nanopi2_defconfig
+F:	doc/README.s5p4418
+F:	drivers/gpio/nx_gpio.c
+F:	drivers/i2c/nx_i2c.c
+F:	drivers/mmc/nexell_dw_mmc_dm.c
+F:	drivers/pinctrl/nexell/
+F:	drivers/video/nexell/
+F:	drivers/video/nexell_display.c
+F:	include/configs/s5p4418_nanopi2.h
+
 ARM OWL
 M:	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 S:	Maintained