drm/amd/powerplay: support temperature emergency max values

These new interfaces(temp1_emergency, temp2_emergency,
temp3_emergency) are supported on SOC15 dGPUs only.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>