drm/amd/display: Remove unneeded semicolon in display_rq_dlg_calc_21.c

drm/amd/display: Remove unneeded semicolon in display_rq_dlg_calc_21.c

Fixes coccicheck warning:

drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c:1525:144-145: Unneeded semicolon
drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c:1526:142-143: Unneeded semicolon

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>