drm/amd: Don't show warning on reading vbios values for SMU13 3.1

Some APUs with SMU13 are showing the following message:
`amdgpu 0000:63:00.0: amdgpu: Unexpected and unhandled version: 3.1`

This warning isn't relevant for smu info 3.1, as no bootup information
is present in the table.

Fixes: 593a54f1 ("drm/amd/pm: correct the way for retrieving bootup clocks")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>