drm/amd/powerplay: update vega10 smu interface version to E.

need update smu firmware to version 0x1c20.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewws-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>