apl: memory: expand number of 256 Bytes block to be 128

Still lack of this size HP buffer when enable all 6 ssps on APL.

Signed-off-by: Pan Xiuli <xiuli.pan@linux.intel.com>

Author: xiulipan

src/platform/apollolake/include/platform/memory.h

@@ -137,7 +137,7 @@
 #define HEAP_RT_COUNT32			128
 #define HEAP_RT_COUNT64			64
 #define HEAP_RT_COUNT128		32
-#define HEAP_RT_COUNT256		64
+#define HEAP_RT_COUNT256		128
 #define HEAP_RT_COUNT512		8
 #define HEAP_RT_COUNT1024		4