drm/amdgpu: move dpcs headers to dpcs includes

- create dpcs directory for dpcs asic_reg headers
- move dpcs21 reg headers from dcn to dpcs directory

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/include/asic_reg/dcn/dpcs_2_1_0_offset.h b/drivers/gpu/drm/amd/include/asic_reg/dpcs/dpcs_2_1_0_offset.h
similarity index 100%
rename from drivers/gpu/drm/amd/include/asic_reg/dcn/dpcs_2_1_0_offset.h
rename to drivers/gpu/drm/amd/include/asic_reg/dpcs/dpcs_2_1_0_offset.h

diff --git a/drivers/gpu/drm/amd/include/asic_reg/dcn/dpcs_2_1_0_sh_mask.h b/drivers/gpu/drm/amd/include/asic_reg/dpcs/dpcs_2_1_0_sh_mask.h
similarity index 100%
rename from drivers/gpu/drm/amd/include/asic_reg/dcn/dpcs_2_1_0_sh_mask.h
rename to drivers/gpu/drm/amd/include/asic_reg/dpcs/dpcs_2_1_0_sh_mask.h