drm/amd/amdgpu: fix the HDP LS/DS/SD programming
confirmed that IPH_MEM_POWER_CTRL_EN and RC_MEM_POWER_CTRL_EN have to be set for SRAM LS/DS/SD Signed-off-by: Kenneth Feng <kenneth.feng@amd.com> Reviewed-by: Likun Gao <Likun.Gao@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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