drm/panfrost: fix UAPI kernel-doc warnings

drm/panfrost: fix UAPI kernel-doc warnings

Fix all kernel-doc warnings in include/uapi/drm/panfrost_drm.h.
This mostly means modifying existing comments to conform to
kernel-doc format, but there also some additions of missing
kernel-doc comments and changing non-kernel-doc comments to
use "/*" to begin them.

Warning: panfrost_drm.h:83 struct member 'jc' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'in_syncs' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'in_sync_count' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'out_sync' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'bo_handles' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'bo_handle_count' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'requirements' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'jm_ctx_handle' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:83 struct member 'pad' not described
 in 'drm_panfrost_submit'
Warning: panfrost_drm.h:116 Incorrect use of kernel-doc format:
  * Returned offset for the BO in the GPU address space.  This offset
Warning: panfrost_drm.h:124 struct member 'size' not described
 in 'drm_panfrost_create_bo'
Warning: panfrost_drm.h:124 struct member 'flags' not described
 in 'drm_panfrost_create_bo'
Warning: panfrost_drm.h:124 struct member 'handle' not described
 in 'drm_panfrost_create_bo'
Warning: panfrost_drm.h:124 struct member 'pad' not described
 in 'drm_panfrost_create_bo'
Warning: panfrost_drm.h:124 struct member 'nonzero' not described
 in 'drm_panfrost_create_bo'
Warning: panfrost_drm.h:143 struct member 'handle' not described
 in 'drm_panfrost_mmap_bo'
Warning: panfrost_drm.h:143 struct member 'flags' not described
 in 'drm_panfrost_mmap_bo'
Warning: panfrost_drm.h:143 struct member 'offset' not described
 in 'drm_panfrost_mmap_bo'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patch.msgid.link/20251031054152.1406764-1-rdunlap@infradead.org