drm/amd/display: remove unnecessary conversion to bool

Fix the following coccicheck warnings:

./drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp_cm.c:243:67-72:
WARNING: conversion to bool not needed here.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp_cm.c

@@ -240,7 +240,7 @@ bool dpp3_program_gamcor_lut(
 		next_mode = LUT_RAM_A;
 
 	dpp3_power_on_gamcor_lut(dpp_base, true);
-	dpp3_configure_gamcor_lut(dpp_base, next_mode == LUT_RAM_A ? true:false);
+	dpp3_configure_gamcor_lut(dpp_base, next_mode == LUT_RAM_A);
 
 	if (next_mode == LUT_RAM_B) {
 		gam_regs.start_cntl_b = REG(CM_GAMCOR_RAMB_START_CNTL_B);