drm: Remove usage of deprecated DRM_DEBUG_PRIME

drm_print.h says DRM_DEBUG_PRIME is deprecated in favor of
drm_dbg_prime().

Signed-off-by: Siddh Raman Pant <code@siddh.me>
Reviewed-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patchwork.freedesktop.org/patch/msgid/cd663b1bc42189e55898cddecdb3b73c591b341a.1673269059.git.code@siddh.me