fpga: xilinx: Avoid CamelCase for in Xilinx_desc

No functional changes.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/matrix_vision/mvsmr/fpga.c b/board/matrix_vision/mvsmr/fpga.c
index b207455..51899257 100644
--- a/board/matrix_vision/mvsmr/fpga.c
+++ b/board/matrix_vision/mvsmr/fpga.c
@@ -26,7 +26,7 @@
 	0
 };
 
-Xilinx_desc spartan3 = {
+xilinx_desc spartan3 = {
 	xilinx_spartan2,
 	slave_serial,
 	XILINX_XC3S200_SIZE,