nb/intel: add IS_ENABLED() around Kconfig symbol references

Some of these can be changed from #if to if(), but that will happen
in a follow-on commmit.

Change-Id: Id5bc8b75b1fa372f31982b8636f1efa4975b61a5
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20346
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/northbridge/intel/sandybridge/early_init.c b/src/northbridge/intel/sandybridge/early_init.c
index efe27b1..3580f35 100644
--- a/src/northbridge/intel/sandybridge/early_init.c
+++ b/src/northbridge/intel/sandybridge/early_init.c
@@ -60,7 +60,7 @@
 	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM5, 0x33);
 	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM6, 0x33);
 
-#if CONFIG_ELOG_BOOT_COUNT
+#if IS_ENABLED(CONFIG_ELOG_BOOT_COUNT)
 	/* Increment Boot Counter for non-S3 resume */
 	if ((inw(DEFAULT_PMBASE + PM1_STS) & WAK_STS) &&
 	    ((inl(DEFAULT_PMBASE + PM1_CNT) >> 10) & 7) != SLP_TYP_S3)
@@ -69,7 +69,7 @@
 
 	printk(BIOS_DEBUG, " done.\n");
 
-#if CONFIG_ELOG_BOOT_COUNT
+#if IS_ENABLED(CONFIG_ELOG_BOOT_COUNT)
 	/* Increment Boot Counter except when resuming from S3 */
 	if ((inw(DEFAULT_PMBASE + PM1_STS) & WAK_STS) &&
 	    ((inl(DEFAULT_PMBASE + PM1_CNT) >> 10) & 7) == SLP_TYP_S3)