nb/intel/ironlake: Use new fixed BAR accessors

Tested with BUILD_TIMELESS=1, Packard Bell MS2290 remains identical.

Change-Id: Ia0a086bd28b796d2cbe1c7a056922721c95612b8
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51868
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/ironlake/early_init.c b/src/northbridge/intel/ironlake/early_init.c
index 767db0d..1e4d0dc 100644
--- a/src/northbridge/intel/ironlake/early_init.c
+++ b/src/northbridge/intel/ironlake/early_init.c
@@ -112,7 +112,7 @@
 
 	/* Magic for S3 resume. Must be done early.  */
 	if (s3_resume) {
-		MCHBAR32(0x1e8) = (MCHBAR32(0x1e8) & ~1) | 6;
-		MCHBAR32(0x1e8) = (MCHBAR32(0x1e8) & ~3) | 4;
+		mchbar_clrsetbits32(0x1e8, 1, 6);
+		mchbar_clrsetbits32(0x1e8, 3, 4);
 	}
 }