drm/amd/powerplay: fix typos for clk map

It should be DCLK1->PPCLK_DCLK_1 and VCLK->PPCLK_VCLK_0.

Signed-off-by: Jiansong Chen <Jiansong.Chen@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Acked-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>