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/Makefile b/board/opalkelly/zynq/Makefile
new file mode 100644
index 0000000..09fc788
--- /dev/null
+++ b/board/opalkelly/zynq/Makefile
@@ -0,0 +1,9 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	:= board.o
+
+hw-platform-y :=$(shell echo $(CONFIG_DEFAULT_DEVICE_TREE))
+
+obj-$(CONFIG_SPL_BUILD) += $(hw-platform-y)/ps7_init_gpl.o