board: synquacer: Add DeveloperBox 96boards EE support

Add the DeveloperBox 96boards EE support. This board is also
known as Socionext SynQuacer E-Series. It contians one "SC2A11"
SoC, which has 24-cores of arm Cortex-A53, and 4 DDR3 slots,
3 PCIe slots (1 4x port and 2 1x ports which are expanded via
PCIe bridge chip), 2 USB 3.0 ports and 2 USB 2.0 ports, 2 SATA
ports and 1 GbE, 64MB NOR flash and 8GB eMMC on standard
MicroATX Form Factor.

For more information, see this page;
  https://www.96boards.org/product/developerbox/

Signed-off-by: Masami Hiramatsu <masami.hiramatsu@linaro.org>
diff --git a/board/socionext/developerbox/MAINTAINERS b/board/socionext/developerbox/MAINTAINERS
new file mode 100644
index 0000000..aa672b6
--- /dev/null
+++ b/board/socionext/developerbox/MAINTAINERS
@@ -0,0 +1,14 @@
+DEVELOPER BOX
+M:	Masami Hiramatsu <masami.hiramatsu@linaro.org>
+M:	Jassi Brar <jaswinder.singh@linaro.org>
+S:	Maintained
+F:	arch/arm/dts/synquacer-*
+F:	board/socionext/developerbox/*
+F:	configs/synquacer_developerbox_defconfig
+F:	drivers/i2c/synquacer_i2c.c
+F:	drivers/mmc/f_sdh30.c
+F:	drivers/net/sni_netsec.c
+F:	drivers/pci/pcie_ecam_synquacer.c
+F:	drivers/spi/spi-synquacer.c
+F:	include/configs/synquacer.h
+F:	doc/board/socionext/developerbox.rst