drm/amd/powerplay: introduce the function to load the soft pptable for navi10 (v2)

Driver is able to load soft pptable from smc bin file with this function. We
stored the soft pptable in the bottom of smc.bin that the version is v2.

v2: remove is_fw_v2_0 flag.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>