wifi: nxp: add nxpwifi driver for IW61x

Add support for the NXP IW61x wireless devices.

The nxpwifi driver implements a full-MAC design and integrates with
cfg80211 for configuration and control, supporting both station (STA)
and access point (AP) modes.

The driver provides a firmware-based command/event interface using TLV
messages, with the core handling command processing, event dispatching,
and device lifecycle management. A SDIO transport layer is implemented
to support IW61x devices.

Key features include:
- 802.11n/ac/ax (HT/VHT/HE) capability support
- Scan, association, and connection management
- Data path handling for TX/RX, including aggregation and reorder
- WMM QoS support and traffic prioritization
- 802.11h (DFS/TPC) support for regulatory compliance
- cfg80211 integration for STA and AP operations
- Debugfs and ethtool support
- Wake-on-LAN support

The driver translates cfg80211 configuration into firmware commands
and implements required data path processing in software where needed.

Signed-off-by: Jeff Chen <jeff.chen_1@nxp.com>

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