SVN r346645 breaks build of DRM drivers

[Michael Butler]

The removal of dma_mask (around line 105) in
/usr/src/sys/compat/linuxkpi/common/include/linux/device.h breaks the
DRM loadable modules :-(

As follows ..

--- amdgpu_amdkfd.o ---
/usr/ports/graphics/drm-current-kmod/work/kms-drm-068d6be/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:284:37:
error: no member named 'dma_mask' in 'struct device'
        uint64_t address_mask = adev->dev->dma_mask ?
~*adev->dev->dma_mask :
                                ~~~~~~~~~  ^
/usr/ports/graphics/drm-current-kmod/work/kms-drm-068d6be/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:284:61:
error: no member named 'dma_mask' in 'struct device'
        uint64_t address_mask = adev->dev->dma_mask ?
~*adev->dev->dma_mask :
                                                        ~~~~~~~~~  ^
2 errors generated.

	imb