ARM: socfpga: add support for IS1 board

This adds support for IS1 board. Pretty usual socfpga board,
256MB of RAM, does not have MMC, two SPI chips, one ethernet port, two
additional ethernet ports connected to the FPGA.

Signed-off-by: Pavel Machek <pavel@denx.de>
diff --git a/board/is1/MAINTAINERS b/board/is1/MAINTAINERS
new file mode 100644
index 0000000..a737e13
--- /dev/null
+++ b/board/is1/MAINTAINERS
@@ -0,0 +1,6 @@
+SOCFPGA IS1 BOARD
+M:	Pavel Machek <pavel@denx.de>
+S:	Maintained
+F:	board/is1/
+F:	include/configs/socfpga_is1.h
+F:	configs/socfpga_is1_defconfig