drm/panthor: Drop the dev_enter/exit() sections in _irq_suspend/resume()

There's no reason for _irq_suspend/resume() to be called after the
device has been unplugged, and keeping this dev_enter/exit()
section in _irq_suspend() is turns _irq_suspend() into a NOP
when called from the _unplug() functions, which we don't want.

v3:
- New patch

Fixes: 5fe909ca ("drm/panthor: Add the device logical block")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240326111205.510019-3-boris.brezillon@collabora.com

drivers/gpu/drm/panthor/panthor_device.h

@@ -326,13 +326,8 @@ static inline void panthor_ ## __name ## _irq_suspend(struct panthor_irq *pirq)
 	int cookie;										\
 												\
 	pirq->mask = 0;										\
-												\
-	if (drm_dev_enter(&pirq->ptdev->base, &cookie)) {					\
 	gpu_write(pirq->ptdev, __reg_prefix ## _INT_MASK, 0);					\
 	synchronize_irq(pirq->irq);								\
-		drm_dev_exit(cookie);								\
-	}											\
-												\
 	atomic_set(&pirq->suspended, true);							\
 }												\
 												\
@@ -342,12 +337,8 @@ static inline void panthor_ ## __name ## _irq_resume(struct panthor_irq *pirq, u
 												\
 	atomic_set(&pirq->suspended, false);							\
 	pirq->mask = mask;									\
-												\
-	if (drm_dev_enter(&pirq->ptdev->base, &cookie)) {					\
 	gpu_write(pirq->ptdev, __reg_prefix ## _INT_CLEAR, mask);				\
 	gpu_write(pirq->ptdev, __reg_prefix ## _INT_MASK, mask);				\
-		drm_dev_exit(cookie);								\
-	}											\
 }												\
 												\
 static int panthor_request_ ## __name ## _irq(struct panthor_device *ptdev,			\