drm/amd/display: move FPU code from dcn301 clk mgr to DML folder

The -mno-gnu-attribute option in dcn301 clk mgr makefile hides a soft vs
hard fp error for powerpc. After removing this flag, we can see some FPU
code remains there:

gcc-11.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld:
drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses
hard float,
drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn301/vg_clk_mgr.o
uses soft float

Therefore, remove the -mno-gnu-attribute flag for dcn301/powerpc and
move FPU-associated code to DML folder.

Signed-off-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Maíra Canal <mairacanal@riseup.net>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>