fs/btrfs: use asm/unaligned.h

Use asm/unaligned.h instead of linux/unaligned/access_ok.h for unaligned
access. This is needed on architectures that doesn't handle unaligned
accesses directly.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/fs/btrfs/crypto/hash.c b/fs/btrfs/crypto/hash.c
index 891a297..0a0b35f 100644
--- a/fs/btrfs/crypto/hash.c
+++ b/fs/btrfs/crypto/hash.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 
+#include <asm/unaligned.h>
 #include <linux/xxhash.h>
-#include <linux/unaligned/access_ok.h>
 #include <linux/types.h>
 #include <u-boot/sha256.h>
 #include <u-boot/blake2.h>