drm/panthor: Add the device logical block

The panthor driver is designed in a modular way, where each logical
block is dealing with a specific HW-block or software feature. In order
for those blocks to communicate with each other, we need a central
panthor_device collecting all the blocks, and exposing some common
features, like interrupt handling, power management, reset, ...

This what this panthor_device logical block is about.

v6:
- Add Maxime's and Heiko's acks
- Keep header inclusion alphabetically ordered

v5:
- Suspend the MMU/GPU blocks if panthor_fw_resume() fails in
  panthor_device_resume()
- Move the pm_runtime_use_autosuspend() call before drm_dev_register()
- Add Liviu's R-b

v4:
- Check drmm_mutex_init() return code
- Fix panthor_device_reset_work() out path
- Fix the race in the unplug logic
- Fix typos
- Unplug blocks when something fails in panthor_device_init()
- Add Steve's R-b

v3:
- Add acks for the MIT+GPL2 relicensing
- Fix 32-bit support
- Shorten the sections protected by panthor_device::pm::mmio_lock to fix
  lock ordering issues.
- Rename panthor_device::pm::lock into panthor_device::pm::mmio_lock to
  better reflect what this lock is protecting
- Use dev_err_probe()
- Make sure we call drm_dev_exit() when something fails half-way in
  panthor_device_reset_work()
- Replace CSF_GPU_LATEST_FLUSH_ID_DEFAULT with a constant '1' and a
  comment to explain. Also remove setting the dummy flush ID on suspend.
- Remove drm_WARN_ON() in panthor_exception_name()
- Check pirq->suspended in panthor_xxx_irq_raw_handler()

Co-developed-by: Steven Price <[email protected]>
Signed-off-by: Steven Price <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>
Acked-by: Steven Price <[email protected]> # MIT+GPL2 relicensing,Arm
Acked-by: Grant Likely <[email protected]> # MIT+GPL2 relicensing,Linaro
Acked-by: Boris Brezillon <[email protected]> # MIT+GPL2 relicensing,Collabora
Reviewed-by: Steven Price <[email protected]>
Reviewed-by: Liviu Dudau <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Acked-by: Heiko Stuebner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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