drm/amd/display: Move insert entry table to the FPU code

The insert_entry_into_table_sorted function uses FPU operation and calls
other static functions support. This commit moves the insert entry
function with all the required struct and static functions to the FPU
file.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>