drm/amdgpu: Remove unnecessary conversion to bool

Fix the following coccicheck warnings:

./drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c:2252:40-45: 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/amdgpu/sdma_v4_0.c

@@ -2249,7 +2249,7 @@ static int sdma_v4_0_set_powergating_state(void *handle,
 	case CHIP_RAVEN:
 	case CHIP_RENOIR:
 		sdma_v4_1_update_power_gating(adev,
-				state == AMD_PG_STATE_GATE ? true : false);
+				state == AMD_PG_STATE_GATE);
 		break;
 	default:
 		break;