STM32F767ZI: Integrate NetX Duo TCP/IP Stack

[alieissa-commits]

Description

Bring up the NetX Duo network stack using a configured Ethernet RMII MAC and LAN8742A PHY layer. Establish DHCP network address allocation and run basic connectivity tests.

• Implement low-level Ethernet controller and RMII pin configurations.
• Write the initialization sequence for the on-board LAN8742A Ethernet PHY to prepare for the NetX Duo IP stack.
• Add NetX Duo library dependency to the STM32 CMake target.
• Implement NetX Duo Ethernet driver wrapper
• Initialize NetX Duo kernel system and allocate packet pools.
• Implement and test DHCP client client-address acquisition.
• Build a simple TCP Echo Server thread to verify bi-directional socket transmissions.