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/arch/arm/Kconfig b/arch/arm/Kconfig
index 993772b..03529d7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1778,6 +1778,19 @@
 	  Support for UniPhier SoC family developed by Socionext Inc.
 	  (formerly, System LSI Business Division of Panasonic Corporation)
 
+config ARCH_SYNQUACER
+	bool "Socionext SynQuacer SoCs"
+	select ARM64
+	select DM
+	select GIC_V3
+	select PSCI_RESET
+	select SYSRESET
+	select SYSRESET_PSCI
+	select OF_CONTROL
+	help
+	  Support for SynQuacer SoC family developed by Socionext Inc.
+	  This SoC is used on 96boards EE DeveloperBox.
+
 config ARCH_STM32
 	bool "Support STMicroelectronics STM32 MCU with cortex M"
 	select CPU_V7M
@@ -2121,6 +2134,7 @@
 source "board/kontron/sl28/Kconfig"
 source "board/myir/mys_6ulx/Kconfig"
 source "board/seeed/npi_imx6ull/Kconfig"
+source "board/socionext/developerbox/Kconfig"
 source "board/spear/spear300/Kconfig"
 source "board/spear/spear310/Kconfig"
 source "board/spear/spear320/Kconfig"