[PATCH for-4.18] docs/misra: Add missing SPDX tags

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Two files are missing SDPX tags, but are covered by the blanketing license
statement in docs/README.sources saying that RST files are CC-BY-4.0

Fixes: 3c911be55f1c ("docs/misra: document the C dialect and translation 
toolchain assumptions.")
Fixes: 7211904e09bd ("docs/misra: add documentation skeleton for MISRA C:2012 
Dir 4.1")
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Federico Serafini <federico.serafini@xxxxxxxxxxx>
CC: Luca Fancellu <luca.fancellu@xxxxxxx>
CC: Michal Orzel <michal.orzel@xxxxxxx>
CC: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
CC: Roberto Bagnara <roberto.bagnara@xxxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Henry Wang <Henry.Wang@xxxxxxx>

CC Henry as this does ideally want backporting to 4.18

To everyone else, please remember SPDX tags on new files.
---
 docs/misra/C-language-toolchain.rst | 2 ++
 docs/misra/C-runtime-failures.rst   | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/docs/misra/C-language-toolchain.rst 
b/docs/misra/C-language-toolchain.rst
index 4c4942a11321..2866cb191b1a 100644
--- a/docs/misra/C-language-toolchain.rst
+++ b/docs/misra/C-language-toolchain.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: CC-BY-4.0
+
 =============================================
 C Dialect and Translation Assumptions for Xen
 =============================================
diff --git a/docs/misra/C-runtime-failures.rst 
b/docs/misra/C-runtime-failures.rst
index 77e04a2562b8..1052b2afca13 100644
--- a/docs/misra/C-runtime-failures.rst
+++ b/docs/misra/C-runtime-failures.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: CC-BY-4.0
+
 ===================================================================
 Measures taken towards the minimization of Run-time failures in Xen
 ===================================================================

base-commit: bede1c7e3b790b63f1ff3ea3ee4e476b012fdf2c
-- 
2.30.2