drm/amd/pm: Remove host limit metrics support

Firmware algorithm changed and the values in this version
are not accurate thereby remove host limit metric support
for smu_v13_0_6, smu_v13_0_12 & smu_v13_0_14

Signed-off-by: Asad Kamal <asad.kamal@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>