change drm_dev_dbg & drm_dbg to macros, which forward to the renamed
functions (with __ prefix added).

Those functions sit below the categorized layer of macros implementing
the DRM debug.category API, and implement most of it.  These are good
places to insert dynamic-debug jump-label mechanics, which will allow
DRM to avoid the runtime cost of drm_debug_enabled().

no functional changes.

memory cost baseline: (unchanged)
bash-5.1# drms_load
[    9.220389] dyndbg:   1 debug prints in module drm
[    9.224426] ACPI: bus type drm_connector registered
[    9.302192] dyndbg:   2 debug prints in module ttm
[    9.305033] dyndbg:   8 debug prints in module video
[    9.627563] dyndbg: 127 debug prints in module i915
[    9.721505] AMD-Vi: AMD IOMMUv2 functionality not available on this system - This is not a bug.
[   10.091345] dyndbg: 2196 debug prints in module amdgpu
[   10.106589] [drm] amdgpu kernel modesetting enabled.
[   10.107270] amdgpu: CRAT table not found
[   10.107926] amdgpu: Virtual CRAT table created for CPU
[   10.108398] amdgpu: Topology: Add CPU node
[   10.168507] dyndbg:   3 debug prints in module wmi
[   10.329587] dyndbg:   3 debug prints in module nouveau
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220912052852.1123868-4-jim.cromie@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>