drm/amd/display: Simplify bool conversion

Fix the following coccicheck warning:
./drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c:3137:35-40:
WARNING: conversion to bool not needed here
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Suggested-by: Yang Li <oswb@linux.alibaba.com>
Signed-off-by: Abaci Team <abaci-bugfix@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -3134,7 +3134,7 @@ void dcn10_setup_stereo(struct pipe_ctx *pipe_ctx, struct dc *dc)
 
 	pipe_ctx->stream_res.opp->funcs->opp_program_stereo(
 		pipe_ctx->stream_res.opp,
-		flags.PROGRAM_STEREO == 1 ? true:false,
+		flags.PROGRAM_STEREO == 1,
 		&stream->timing);
 
 	pipe_ctx->stream_res.tg->funcs->program_stereo(