drm/amd/pm/swsmu: Remove unnecessary conversion to bool

Fix the following coccicheck warnings:

./drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c:924:47-52:
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/pm/swsmu/smu11/sienna_cichlid_ppt.c

@@ -921,7 +921,7 @@ static bool sienna_cichlid_is_support_fine_grained_dpm(struct smu_context *smu,
 	dpm_desc = &pptable->DpmDescriptor[clk_index];
 
 	/* 0 - Fine grained DPM, 1 - Discrete DPM */
-	return dpm_desc->SnapToDiscrete == 0 ? true : false;
+	return dpm_desc->SnapToDiscrete == 0;
 }
 
 static bool sienna_cichlid_is_od_feature_supported(struct smu_11_0_7_overdrive_table *od_table,