Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/kernel/dma/virt.c b/kernel/dma/virt.c
index 631ddec..ebe1288 100644
--- a/kernel/dma/virt.c
+++ b/kernel/dma/virt.c
@@ -13,7 +13,7 @@
 {
 	void *ret;
 
-	ret = (void *)__get_free_pages(gfp, get_order(size));
+	ret = (void *)__get_free_pages(gfp | __GFP_ZERO, get_order(size));
 	if (ret)
 		*dma_handle = (uintptr_t)ret;
 	return ret;