x86: fsp: Use if() instead of #ifdef

Update a few #ifdefs to if() to improve build coverage.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: recover the codes that got wrongly deleted in dram_init()]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/fsp1/fsp_common.c b/arch/x86/lib/fsp1/fsp_common.c
index 591eef7..bfd76dc 100644
--- a/arch/x86/lib/fsp1/fsp_common.c
+++ b/arch/x86/lib/fsp1/fsp_common.c
@@ -116,11 +116,10 @@
 #endif
 
 	if (!gd->arch.hob_list) {
-#ifdef CONFIG_ENABLE_MRC_CACHE
-		nvs = fsp_prepare_mrc_cache();
-#else
-		nvs = NULL;
-#endif
+		if (IS_ENABLED(CONFIG_ENABLE_MRC_CACHE))
+			nvs = fsp_prepare_mrc_cache();
+		else
+			nvs = NULL;
 
 #ifdef CONFIG_HAVE_ACPI_RESUME
 		if (prev_sleep_state == ACPI_S3) {
diff --git a/arch/x86/lib/fsp1/fsp_dram.c b/arch/x86/lib/fsp1/fsp_dram.c
index 3bf65b4..75341bc 100644
--- a/arch/x86/lib/fsp1/fsp_dram.c
+++ b/arch/x86/lib/fsp1/fsp_dram.c
@@ -32,10 +32,9 @@
 	gd->ram_size = ram_size;
 	post_code(POST_DRAM);
 
-#ifdef CONFIG_ENABLE_MRC_CACHE
-	gd->arch.mrc_output = fsp_get_nvs_data(gd->arch.hob_list,
+	if (IS_ENABLED(CONFIG_ENABLE_MRC_CACHE))
+		gd->arch.mrc_output = fsp_get_nvs_data(gd->arch.hob_list,
 					       &gd->arch.mrc_output_len);
-#endif
 
 	return 0;
 }