misra: deviate MISRA C Rule 5.5 for hypfs_alloc_dyndata()

MISRA C Rule 5.5 states: "Identifiers shall be distinct from macro
names".

Update ECLAIR configuration to deviate identifier and macro name
clashes by specifying the macros that should be ignored.
This includes hypfs_alloc_dyndata(), where the real function takes
an allocation size and the same-named macro is a typed convenience
wrapper that expands calls using sizeof(type).

Update deviations.rst and rules.rst accordingly.

Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@epam.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

docs/misra/deviations.rst

@@ -176,6 +176,15 @@ Deviations related to MISRA C:2012 Rules:
        unused 2nd and 3rd parameters to avoid warnings or errors related to them.
      - ECLAIR has been configured to ignore these macros.
 
+   * - R5.5
+     - Clash between the hypfs_alloc_dyndata() function and macro name in the
+       file xen/include/xen/hypfs.h is deliberate. The function is the allocator
+       taking a size in bytes, while the macro is a typed convenience wrapper used
+       by dynamic hypfs nodes to allocate per-request traversal data with the
+       correct size and return type. The implementation explicitly undefines the
+       macro before defining the real function, so the name clash is controlled.
+     - ECLAIR has been configured to ignore this macro.
+
    * - R5.6
      - The type ret_t is deliberately defined multiple times depending on the
        type of guest to service.

docs/misra/rules.rst

@@ -223,6 +223,10 @@ maintainers if you want to suggest a change.
        Clashes between grant table functions and macro names are allowed
        because they are used for discarding unused parameters.
 
+       Clash between hypfs_alloc_dyndata() function and macro name in the
+       file xen/include/xen/hypfs.h is allowed because the macro is a typed
+       convenience wrapper around the size-based allocation function.
+
    * - `Rule 5.6 <https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_05_06.c>`_
      - Required
      - A typedef name shall be a unique identifier