amdgpu: update raven2 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>
diff --git a/amdgpu/raven2_asd.bin b/amdgpu/raven2_asd.bin
index c9875d5..4d407e4 100644
--- a/amdgpu/raven2_asd.bin
+++ b/amdgpu/raven2_asd.bin
Binary files differ