arm: zynq: Add support for SYZYGY Hub board

Add the Zynq-based SYZYGY Hub board from Opal Kelly. The board
contains a Xilinx Zynq xc7z012s SoC, 1GB DDR3 RAM, and supports
booting from SD.

Signed-off-by: Tom McLeod <tom.mcleod@opalkelly.com>
Cc: Michal Simek <monstr@monstr.eu>
CC: Albert Aribaud <albert.u.boot@aribaud.net>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/opalkelly/zynq/MAINTAINERS b/board/opalkelly/zynq/MAINTAINERS
new file mode 100644
index 0000000..df4b9b6
--- /dev/null
+++ b/board/opalkelly/zynq/MAINTAINERS
@@ -0,0 +1,6 @@
+ZYNQ BOARD
+M:	Tom McLeod <tom.mcleod@opalkelly.com>
+S:	Maintained
+F:	board/opalkelly/zynq/
+F:	include/configs/syzygy_hub.h
+F:	configs/syzygy_hub_defconfig