microblaze: Add option to pass cpu version number

Toolchain can use some flags by default based on cpu version.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/microblaze-generic/Kconfig b/board/xilinx/microblaze-generic/Kconfig
index 01c157e..c8b11ca 100644
--- a/board/xilinx/microblaze-generic/Kconfig
+++ b/board/xilinx/microblaze-generic/Kconfig
@@ -25,4 +25,8 @@
 	int "USE_HW_MUL values (0=NONE, 1=MUL32, 2=MUL64)"
 	default 0
 
+config XILINX_MICROBLAZE0_HW_VER
+	string "Core version number"
+	default 7.10.d
+
 endif