nb/intel/ironlake: Use `NUM_CHANNELS` macro

Change-Id: I3f4dc26699e3618740af5a0ade1a19599d5a2cc7
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60225
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/northbridge/intel/ironlake/raminit.c b/src/northbridge/intel/ironlake/raminit.c
index 72c3028..9277477 100644
--- a/src/northbridge/intel/ironlake/raminit.c
+++ b/src/northbridge/intel/ironlake/raminit.c
@@ -792,7 +792,7 @@
 		info->max_slots_used_in_channel = 2;
 	else
 		info->max_slots_used_in_channel = 1;
-	for (channel = 0; channel < 2; channel++)
+	for (channel = 0; channel < NUM_CHANNELS; channel++)
 		mchbar_write32(0x244 + (channel << 10),
 			((info->revision < 8) ? 1 : 0x200) |
 			((2 - info->max_slots_used_in_channel) << 17) |