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: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/intel_common/car.S

@@ -235,7 +235,7 @@ mtrr_table_end:
 
 	.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 */

arch/x86/lib/fsp/fsp_car.S

@@ -100,7 +100,7 @@ temp_ram_init_romstack:
 	.long	temp_ram_init_params
 temp_ram_init_params:
 _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 */