drm/amd/powerplay: add suspend and resume function for smu

Functional the function of smu suspend and resume.
Modified the function of smu_smc_table_hw_init to make it useful for smu
resume.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>