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/imd_cbmem.c

@@ -62,14 +62,14 @@ static inline const struct imd_entry *cbmem_to_imd(const struct cbmem_entry *e)
 
 /* These are the different situations to handle:
  *  CONFIG_EARLY_CBMEM_INIT:
- *  	In ramstage cbmem_initialize() attempts a recovery of the
- *  	cbmem region set up by romstage. It uses cbmem_top() as the
- *  	starting point of recovery.
+ *      In ramstage cbmem_initialize() attempts a recovery of the
+ *      cbmem region set up by romstage. It uses cbmem_top() as the
+ *      starting point of recovery.
  *
- *  	In romstage, similar to ramstage,  cbmem_initialize() needs to
- *  	attempt recovery of the cbmem area using cbmem_top() as the limit.
- *  	cbmem_initialize_empty() initializes an empty cbmem area from
- *  	cbmem_top();
+ *      In romstage, similar to ramstage,  cbmem_initialize() needs to
+ *      attempt recovery of the cbmem area using cbmem_top() as the limit.
+ *      cbmem_initialize_empty() initializes an empty cbmem area from
+ *      cbmem_top();
  *
  */
 static struct imd *imd_init_backing(struct imd *backing)