workaround for Sphinx false positive preventing indexing

Functions drm_format_info, drm_modeset_lock, drm_ioctl_flags are not being
indexed in the documentation because there are structs with the same name
and sphinx is only indexing one of them, Added them to namespaces as a
workaround for suppressing the warnings and indexing the functions

This is a bug of Sphinx >=3.1, first reported by Mauro in September 2020
Link: sphinx-doc/sphinx#8241
Open Pull Request
Link: sphinx-doc/sphinx#8313

Signed-off-by: Kevin Paul Reddy Janagari <[email protected]>

Author: kevinpaul468

Documentation/gpu/drm-kms.rst

@@ -357,8 +357,10 @@ Format Functions Reference
 .. kernel-doc:: include/drm/drm_fourcc.h
    :internal:
 
+.. c:namespace-push:: gpu_drm
 .. kernel-doc:: drivers/gpu/drm/drm_fourcc.c
    :export:
+.. c:namespace-pop::
 
 .. _kms_dumb_buffer_objects:
 
@@ -473,8 +475,10 @@ KMS Locking
 .. kernel-doc:: include/drm/drm_modeset_lock.h
    :internal:
 
+.. c:namespace:: gpu_drm
 .. kernel-doc:: drivers/gpu/drm/drm_modeset_lock.c
    :export:
+.. c:namespace-pop::
 
 KMS Properties
 ==============

Documentation/gpu/drm-uapi.rst

@@ -554,8 +554,10 @@ DRM specific patterns. Note that ENOTTY has the slightly unintuitive meaning of
 .. kernel-doc:: include/drm/drm_ioctl.h
    :internal:
 
+.. c:namespace-push:: gpu_drm
 .. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
    :export:
+.. c:namespace-pop::
 
 .. kernel-doc:: drivers/gpu/drm/drm_ioc32.c
    :export: