fpga: Guard the LOADMK functionality with CMD_FPGA_LOADMK

Guard the LOADMK functionality with config to provide
an option to enable or disable it.
Enable it for all platforms in mainline which enable CONFIG_CMD_FPGA.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/configs/MVBC_P.h b/include/configs/MVBC_P.h
index 036396c..1ab2b3d 100644
--- a/include/configs/MVBC_P.h
+++ b/include/configs/MVBC_P.h
@@ -89,6 +89,7 @@
 #define CONFIG_CMD_SDRAM
 #define CONFIG_CMD_PCI
 #define CONFIG_CMD_FPGA
+#define CONFIG_CMD_FPGA_LOADMK
 #define CONFIG_CMD_I2C
 
 #undef CONFIG_WATCHDOG