HID: steelseries: split out Arctis driver and add Nova 7 Gen2 support

This series moves the SteelSeries Arctis headset support out of
hid-steelseries.c into its own module, reworks it around a per-model
device_info table, hardens the battery power-supply lifetime, adds an
asynchronous status interface, and finally adds support for the Arctis
Nova 7 Gen2 family. After the split, hid-steelseries.c is left handling
only the SRW-S1 racing wheel.

Changes since v4:
 - Refactor: send the Arctis 1 and Arctis 9 status requests as output
   reports again. v4 regressed these to feature reports during the
   refactor, which can stall the endpoint and break battery polling.
   The now-unused feature-report helper is removed.
 - Refactor: the Arctis 1 parser validates the report length and the
   0x06 0x12 header before consuming a report as battery status,
   instead of parsing every incoming report.
 - Refactor: the Arctis 9 parser only reads capacity/charging from a
   0xaa 0x01 status frame and treats every other frame (including the
   0x55 "no status" and the 0x03 "stale" replies) as disconnected.
 - Refcounting: register the power supply into a local variable and
   publish sd->battery only on success, so a concurrent raw_event can
   never observe an error pointer.
 - Async: publish the sync interface's drvdata only once the device is
   fully initialised, so the async sibling never attaches to a
   half-initialised or failed instance; the probe error path is
   simplified accordingly.
 - Async: the sibling lookup verifies the sibling is bound to this
   driver and takes a reference before using its data, guarding against
   type confusion and use-after-free.
 - Dropped the standalone "Fix whitespace in srws1 report descriptor"
   patch from v4; it was unrelated churn and the descriptor is left
   untouched from upstream.
 - Rebased on the 7.2 merge window.

Sriman Achanta (9):
  HID: steelseries: Fix ARCTIS_1_X device mislabeling
  HID: steelseries: Split Arctis headset driver into separate module
  HID: steelseries: Inline and simplify SRWS1 wheel driver
  HID: steelseries: Refactor Arctis driver to use device_info framework
  HID: steelseries: Report POWER_SUPPLY_STATUS_FULL when full
  HID: steelseries: Correct Arctis 9 battery calibration range
  HID: steelseries: Manage battery lifetime with refcounting
  HID: steelseries: Add async status interface support
  HID: steelseries: Add support for Arctis Nova 7 Gen2 family

 drivers/hid/Makefile                 |   2 +-
 drivers/hid/hid-ids.h                |  12 +-
 drivers/hid/hid-quirks.c             |  10 +-
 drivers/hid/hid-steelseries-arctis.c | 643 +++++++++++++++++++++++++++
 drivers/hid/hid-steelseries.c        | 406 +----------------
 5 files changed, 672 insertions(+), 401 deletions(-)
 create mode 100644 drivers/hid/hid-steelseries-arctis.c


base-commit: 840ef6c78e6a2f694b578ecb9063241c992aaa9e
-- 
2.54.0