git: drm/ttm: Sync ttm_lock.c with Linux

[Francois Tigeot]

commit 652c4042c7549eab6854eb7d36970bef0205a821
Author: François Tigeot <***@wolfpond.org>
Date: Sat Nov 10 09:31:20 2018 +0100

drm/ttm: Sync ttm_lock.c with Linux

Summary of changes:
sys/dev/drm/ttm/ttm_lock.c | 156 +++++++++++++++++----------------------------
1 file changed, 58 insertions(+), 98 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/652c4042c7549eab6854eb7d36970bef0205a821