regression in ttm

[StDenis, Tom]

This commit causes a regression on my Carrizo running piglit (dmesg 
attached)

commit 5786b66c9e3b7b18f3c24566e70cae450969cb14
Refs: v4.20-rc3-498-g5786b66c9e3b
Author:     Christian König <christian.koenig at amd.com>
AuthorDate: Mon Sep 24 13:35:53 2018 +0200
Commit:     Christian König <christian.koenig at amd.com>
CommitDate: Tue Dec 4 10:22:22 2018 +0100

     drm/ttm: drop the extra reservation for pipelined BO moves

     The driver is now responsible to allocate enough shared slots.

     Signed-off-by: Christian König <christian.koenig at amd.com>
     Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>
     Reviewed-by: Junwei Zhang <Jerry.Zhang at amd.com>
     Reviewed-by: Huang Rui <ray.huang at amd.com>

Tom.
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