Update to v5.5 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.5

Test: Boots on walleye.
Test: Ran bionic-unit-tests on walleye.
Test: Boots on cuttlefish.
Test: Ran bionic-unit-tests on cuttlefish.
Change-Id: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
Merged-In: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
diff --git a/libc/kernel/uapi/linux/fscrypt.h b/libc/kernel/uapi/linux/fscrypt.h
index 75a554e..f91ce85 100644
--- a/libc/kernel/uapi/linux/fscrypt.h
+++ b/libc/kernel/uapi/linux/fscrypt.h
@@ -83,7 +83,9 @@
 struct fscrypt_add_key_arg {
   struct fscrypt_key_specifier key_spec;
   __u32 raw_size;
-  __u32 __reserved[9];
+  __u32 __reserved[8];
+#define __FSCRYPT_ADD_KEY_FLAG_HW_WRAPPED 0x00000001
+  __u32 __flags;
   __u8 raw[];
 };
 struct fscrypt_remove_key_arg {