x86: Update a stale comment about ifdtool

We use binman to build the x86 image now. Update a comment which still
refers to ifdtool.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/intel_common/car.S b/arch/x86/cpu/intel_common/car.S
index 52a77bb..00308db 100644
--- a/arch/x86/cpu/intel_common/car.S
+++ b/arch/x86/cpu/intel_common/car.S
@@ -235,7 +235,7 @@
 
 	.align 4
 _dt_ucode_base_size:
-	/* These next two fields are filled in by ifdtool */
+	/* These next two fields are filled in by binman */
 .globl ucode_base
 ucode_base:	/* Declared in microcode.h */
 	.long	0			/* microcode base */