drm/amd/pm: Fix smu v13.0.6 caps initialization

Fix the initialization and usage of SMU v13.0.6 capability values. Use
caps_set/clear functions to set/clear capability.

Also, fix SET_UCLK_MAX capability on APUs, it is supported on APUs.

Fixes: e9b86b8 ("drm/amd/pm: Add capability flags for SMU v13.0.6")
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>