dma-buf: heaps: Remove redundant heap identifier from system heap name

The heaps are already in a directory of heaps, adding _heap to a heap
name is redundant. This patch is only a name change, no logic is changed.

Signed-off-by: Andrew F. Davis <[e-mail]>
Acked-by: John Stultz <[e-mail]>
Signed-off-by: Sumit Semwal <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/dma-buf/heaps/system_heap.c

···
 	struct dma_heap_export_info exp_info;
 	int ret = 0;
 
-	exp_info.name = "system_heap";
+	exp_info.name = "system";
 	exp_info.ops = &system_heap_ops;
 	exp_info.priv = NULL;