amdgpu: update tonga to latest 19.20 firmware

Based on internal git commit:
842aa2c417aa2319390c6266cd29ecc24c96d913

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>
This commit is contained in:
Alex Deucher 2019-07-03 13:58:32 -05:00 committed by Josh Boyer
parent 7b6c49ceb9
commit 9c8161f327
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