Revert "flounder: update kernel prebuild (Jan 2017 NYC-MR1 Security)"

717090a gpu: nvgpu: gk20a: wrap debug session as optional

caused problems in gpu-related activities.

Bug: 33379507
Bug: 33260045
Bug: 32370135
Bug: 33461166

This reverts commit 1f1c93dec3d1a056c750a47052e87500232b5628.

Change-Id: Ie9c071a464e3ffb9dff3b02d4a0b0bda76ce0b01
diff --git a/Image.gz-dtb b/Image.gz-dtb
index a028c36..adee478 100644
--- a/Image.gz-dtb
+++ b/Image.gz-dtb
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