Revert "Workaround: make mmap memory resident for gfx902"

This reverts commit 716755b1de.

Change-Id: I9f4f0b6b426aeae4cb652b33cf0d4c0f57270ca5
Signed-off-by: Yong Zhao <yong.zhao@amd.com>

src/queues.c

@@ -323,9 +323,6 @@ static void *allocate_exec_aligned_memory_cpu(uint32_t size)
 
 	if (ptr == MAP_FAILED)
 		return NULL;
-
-	memset(ptr, 0, size);
-
 	return ptr;
 }