drm/amd/display: block odd h_total timings from halving pixel rate

why:
when dynamic odm was turned on, there is also logic to halve the pixelclk
this still turned on when we avoided odm in the case of odd h_total timings

how:
block the pixel clk mechanism also in the case of odd h_total timings

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Martin Leung <Martin.Leung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>