drm/amd/powerplay: implement get_clk_info_from_vbios function for smu11 (v2)

This patch implements the get_clk_info_from_vbios function for smu11.
We can do execute_vbios_cmd_table to fetch the clk value from vbios.

v2: use the proper cpu_to_le[32|16]() and le[32|16]_to_cpu() macros to handle
endianness. (Alex)

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Kevin Wang <Kevin1.Wang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>