zynq: Do not explicitely enable icache

icache is already enabled by default.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c
index 5a47149..498d143 100644
--- a/board/xilinx/zynq/board.c
+++ b/board/xilinx/zynq/board.c
@@ -59,8 +59,6 @@
 	}
 #endif
 
-	icache_enable();
-
 #ifdef CONFIG_FPGA
 	fpga_init();
 	fpga_add(fpga_xilinx, &fpga);