src/include: Remove spaces before tabs

Fix the following warning detected by checkpatch.pl:

WARNING: please, no space before tabs

TEST=Build and run on Galileo Gen2

Change-Id: If60a58021d595289722d1d6064bea37b0b0bc039
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18652
Tested-by: build bot (Jenkins)
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/include/sdram_mode.h b/src/include/sdram_mode.h
index 3b2faca..78002b70 100644
--- a/src/include/sdram_mode.h
+++ b/src/include/sdram_mode.h
@@ -50,4 +50,4 @@
 #define SDRAM_EXTMODE_DRIVE_NORMAL	(0 << 1)
 #define SDRAM_EXTMODE_DRIVE_WEAK	(1 << 1)	/* Optional */
 
-#endif 	// __SDRAMMODE_H_DEFINED
+#endif	// __SDRAMMODE_H_DEFINED