drm-next build broken

[Tom St Denis]

Hi Amber,

This commit:

commit 7c3a4287bfc05a26baa9d32d060feffe387b9b84 (HEAD -> 
amd-staging-drm-next, origin/amd-staging-drm-next, origin/HEAD)
Author: Amber Lin <Amber.Lin at amd.com>
Date:   Thu Aug 23 10:52:34 2018 -0400

     drm/amdgpu: Move KFD parameters to amdgpu

     After merging KFD into amdgpu, move module parameters defined in KFD to
     amdgpu_drv.c, where other module parameters are declared.

     v2: add kernel-doc comments

     Change-Id: I0f7a4cf601e5f0f3fd8a9d4703f6be00f1774788
     Signed-off-by: Amber Lin <Amber.Lin at amd.com>
     Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>

Breaks the build:

   DESCEND  objtool
   CALL    scripts/checksyscalls.sh
   CHK     include/generated/compile.h
   CC [M]  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.o
In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:42:0:
drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_priv.h:645:22: error: field 
‘mmu_notifier’ has incomplete type
   struct mmu_notifier mmu_notifier;
                       ^~~~~~~~~~~~
scripts/Makefile.build:317: recipe for target 
'drivers/gpu/drm/amd/amdgpu/amdgpu_drv.o' failed
make[4]: *** [drivers/gpu/drm/amd/amdgpu/amdgpu_drv.o] Error 1
scripts/Makefile.build:558: recipe for target 
'drivers/gpu/drm/amd/amdgpu' failed
make[3]: *** [drivers/gpu/drm/amd/amdgpu] Error 2
scripts/Makefile.build:558: recipe for target 'drivers/gpu/drm' failed
make[2]: *** [drivers/gpu/drm] Error 2
scripts/Makefile.build:558: recipe for target 'drivers/gpu' failed
make[1]: *** [drivers/gpu] Error 2
Makefile:1034: recipe for target 'drivers' failed
make: *** [drivers] Error 2


Cheers,
Tom