soc/intel/adl: Only use channel 0 for mem-down DDR4

Fixes: c0ba116 ("soc/intel/adl,mtl: Use channel 0 only for memory down in mixed topo")
Change-Id: I56e7d51b4a06519376d8fe7a345bb434c6f1a24a
Signed-off-by: Tim Crawford <[email protected]>

Author: crawfxrd

src/soc/intel/alderlake/meminit.c

@@ -54,8 +54,8 @@ static const struct soc_mem_cfg soc_mem_cfg[] = {
 			 * configuration.
 			 */
 			.half_channel = BIT(0),
-			/* In mixed topologies, either channel 0 or 1 can be memory-down. */
-			.mixed_topo = BIT(0) | BIT(1),
+			/* In mixed topologies, channel 0 is memory-down. */
+			.mixed_topo = BIT(0),
 		},
 	},
 	[MEM_TYPE_DDR5] = {