configs: remove empty #ifdef block from mv-common.h

The last option guarded by this ifdef was removed in commit 68d534201733
("sf: Move SPI flash drivers to defconfig"). Remove the now empty
ifdef/endif block and the associated comment.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/mv-common.h b/include/configs/mv-common.h
index fa9b5bc..8c5350e 100644
--- a/include/configs/mv-common.h
+++ b/include/configs/mv-common.h
@@ -102,12 +102,6 @@
 #endif
 
 /*
- * Common SPI Flash configuration
- */
-#ifdef CONFIG_CMD_SF
-#endif
-
-/*
  * File system
  */
 #ifdef CONFIG_SYS_MVFS