drm/amd/display: Remove unnecessary amdgpu_irq_get/put

[WHY & HOW]
commit 7fb363c ("drm/amd/display: Let drm_crtc_vblank_on/off manage interrupts")
lets drm_crtc_vblank_* to manage interrupts in amdgpu_dm_crtc_set_vblank,
and amdgpu_irq_get/put do not need to be called here.  Part of that
patch got lost somehow, so fix it up.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -8398,16 +8398,6 @@ static void manage_dm_interrupts(struct amdgpu_device *adev,
 				 struct amdgpu_crtc *acrtc,
 				 struct dm_crtc_state *acrtc_state)
 {
-	/*
-	 * We have no guarantee that the frontend index maps to the same
-	 * backend index - some even map to more than one.
-	 *
-	 * TODO: Use a different interrupt or check DC itself for the mapping.
-	 */
-	int irq_type =
-		amdgpu_display_crtc_idx_to_irq_type(
-			adev,
-			acrtc->crtc_id);
 	struct drm_vblank_crtc_config config = {0};
 	struct dc_crtc_timing *timing;
 	int offdelay;
@@ -8433,28 +8423,7 @@ static void manage_dm_interrupts(struct amdgpu_device *adev,
 
 		drm_crtc_vblank_on_config(&acrtc->base,
 					  &config);
-
-		amdgpu_irq_get(
-			adev,
-			&adev->pageflip_irq,
-			irq_type);
-#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
-		amdgpu_irq_get(
-			adev,
-			&adev->vline0_irq,
-			irq_type);
-#endif
 	} else {
-#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
-		amdgpu_irq_put(
-			adev,
-			&adev->vline0_irq,
-			irq_type);
-#endif
-		amdgpu_irq_put(
-			adev,
-			&adev->pageflip_irq,
-			irq_type);
 		drm_crtc_vblank_off(&acrtc->base);
 	}
 }