cpu/x86: Use tabs for indent

Fix the following error and warning detected by checkpatch.pl:

ERROR: code indent should use tabs where possible
WARNING: please, no spaces at the start of a line

TEST=Build and run on Galileo Gen2

Change-Id: Ie6e4dd4c3eb0d2c44ecd008740dfc348d496fe78
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18841
Tested-by: build bot (Jenkins)
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/x86/smm/smihandler.c

@@ -161,7 +161,7 @@ void smi_handler(u32 smm_revision)
 		state_save.type = EM64T101;
 		state_save.em64t101_state_save =
 			smm_save_state(smm_base,
-			               SMM_EM64T101_ARCH_OFFSET, node);
+				       SMM_EM64T101_ARCH_OFFSET, node);
 		break;
 	case 0x00030064:
 		state_save.type = AMD64;