x86: Avoid #ifdef with CONFIG_HAVE_ACPI_RESUME

At present this enables a few arch-specific members of the global_data
struct which are otherwise not part of the struct. As a result we have to
use #ifdef in various places.

The cost of always having these in the struct is small. Adjust things so
that we can use compile-time code instead of #ifdefs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/fsp2/fsp_dram.c b/arch/x86/lib/fsp2/fsp_dram.c
index 1c82b81..c9f6402 100644
--- a/arch/x86/lib/fsp2/fsp_dram.c
+++ b/arch/x86/lib/fsp2/fsp_dram.c
@@ -27,11 +27,10 @@
 		return 0;
 	}
 	if (spl_phase() == PHASE_SPL) {
-#ifdef CONFIG_HAVE_ACPI_RESUME
-		bool s3wake = gd->arch.prev_sleep_state == ACPI_S3;
-#else
 		bool s3wake = false;
-#endif
+
+		s3wake = IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) &&
+			gd->arch.prev_sleep_state == ACPI_S3;
 
 		ret = fsp_memory_init(s3wake,
 			      IS_ENABLED(CONFIG_APL_BOOT_FROM_FAST_SPI_FLASH));