xen: add deviations for MISRA C 2012 Dir D4.10

Add safe deviation for *.c files, as estabilished in past discussion.

Signed-off-by: Maria Celeste Cesario  <maria.celeste.cesario@bugseng.com>
Signed-off-by: Simone Ballarin  <simone.ballarin@bugseng.com>
Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

docs/misra/deviations.rst

@@ -30,6 +30,12 @@ Deviations related to MISRA C:2012 Directives:
        not to add an additional encapsulation layer.
      - Tagged as `deliberate` for ECLAIR.
 
+   * - D4.10
+     - Including multiple times a .c file is safe because every function or data item
+       it defines would in (the common case) be already defined.
+       Peer reviewed by the community.
+     - Tagged as `safe` for ECLAIR.
+
 Deviations related to MISRA C:2012 Rules:
 -----------------------------------------