swiotlb: Setting default IO TBL value to 1MB

swiotlb was allocting the 64MB of memory at boot up time, because we
used CMA so we do not use it. We can reduce it to 1MB.

Change-Id: I137f6e9069f86dcc9dcd883868b3e8a08c29d710
Signed-off-by: Abhimanyu Garg <agarg@codeaurora.org>

lib/swiotlb.c

@@ -116,8 +116,8 @@ unsigned long swiotlb_nr_tbl(void)
 }
 EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
 
-/* default to 64MB */
-#define IO_TLB_DEFAULT_SIZE (64UL<<20)
+/* default to 1MB */
+#define IO_TLB_DEFAULT_SIZE SZ_1M
 unsigned long swiotlb_size_or_default(void)
 {
 	unsigned long size;