drm/amd/display: move remaining FPU code to dml folder

drm/amd/display: move remaining FPU code to dml folder

In the process of enabling DCN support for arm64, I found that the
dcn10_resource_construct_fp function in dcn10/dcn10_resource.c still
needs to use FPU. This will cause compilation to fail on ARM64 platforms
because -mgeneral-regs-only is enabled by default to disable the
hardware FPU. So move dcn10_resource_construct_fp from dcn10 folder to
dml/dcn10 folder to enable hardware FPU for that function.

Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Ao Zhong <hacc1225@gmail.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>