src/lib: Use tabs instead of spaces

Fix the following errors and warnings detected by checkpatch.pl:

ERROR: code indent should use tabs where possible
ERROR: switch and case should be at the same indent
WARNING: Statements should start on a tabstop
WARNING: please, no spaces at the start of a line
WARNING: please, no space before tabs
WARNING: suspect code indent for conditional statements
WARNING: labels should not be indented

TEST=Build and run on Galileo Gen2

Change-Id: Iebcff26ad41ab6eb0027b871a1c06f3b52dd207c
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18732
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/lib/generic_sdram.c

@@ -26,7 +26,7 @@ void sdram_initialize(int controllers, const struct mem_controller *ctrl)
 	#if CONFIG_RAMINIT_SYSINFO
 		sdram_set_spd_registers(ctrl + i, sysinfo);
 	#else
-                sdram_set_spd_registers(ctrl + i);
+		sdram_set_spd_registers(ctrl + i);
 	#endif
 
 	}