fpga: spartan3: Avoid CamelCase

No functional changes.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/spear/x600/fpga.c b/board/spear/x600/fpga.c
index c06c994..c26eba4 100644
--- a/board/spear/x600/fpga.c
+++ b/board/spear/x600/fpga.c
@@ -163,7 +163,7 @@
 	return assert_write;
 }
 
-static Xilinx_Spartan3_Slave_Serial_fns x600_fpga_fns = {
+static xilinx_spartan3_slave_serial_fns x600_fpga_fns = {
 	fpga_pre_config_fn,
 	fpga_pgm_fn,
 	fpga_clk_fn,