drm-print: add drm_dbg_driver to improve namespace symmetry

drm-print: add drm_dbg_driver to improve namespace symmetry

drm_print defines all of these:
    drm_dbg_{core,kms,prime,atomic,vbl,lease,_dp,_drmres}

but not drm_dbg_driver itself, since it was the original drm_dbg.

To improve namespace symmetry, change the drm_dbg defn to
drm_dbg_driver, and redef grandfathered name to symmetric one.

This will help with nouveau, which uses its own stack of macros to
construct calls to dev_info, dev_dbg, etc, for which adaptation means
drm_dbg_##driver constructs.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220912052852.1123868-7-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>