zynq: kconfig: move board select menu and common settings

Becuase the board select menu in arch/arm/Kconfig is too big,
move the Zynq board select menu to zynq/Kconfig.

Consolidate also common settings (CONFIG_SYS_CPU="armv7" and
CONFIG_SYS_SOC="zynq").

Refactor board/xilinx/zynq/MAINTAINERS too.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/zynq/MAINTAINERS b/board/xilinx/zynq/MAINTAINERS
index e167816..382e921 100644
--- a/board/xilinx/zynq/MAINTAINERS
+++ b/board/xilinx/zynq/MAINTAINERS
@@ -3,13 +3,5 @@
 M:	Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
 S:	Maintained
 F:	board/xilinx/zynq/
-F:	include/configs/zynq_microzed.h
-F:	configs/zynq_microzed_defconfig
-F:	include/configs/zynq_zc70x.h
-F:	configs/zynq_zc70x_defconfig
-F:	include/configs/zynq_zc770.h
-F:	configs/zynq_zc770_xm010_defconfig
-F:	configs/zynq_zc770_xm012_defconfig
-F:	configs/zynq_zc770_xm013_defconfig
-F:	include/configs/zynq_zed.h
-F:	configs/zynq_zed_defconfig
+F:	include/configs/zynq*.h
+F:	configs/zynq_*_defconfig