intel: combo PHY initialization for Xe2/Gen11+
Add display_combo_phy.rs for ICL/TGL/ADL/ARL combo PHY setup.
Combo PHY must be initialized before DDI programming on Gen11+.
- display_combo_phy.rs: ComboPhy struct with init_all(), init_phy(),
power_up_lanes(), is_enabled(). Programs ICL_PORT_CL_DW5 (power),
ICL_PORT_CL_DW10 (lane power-up), ICL_PORT_CL_DW12 (idle mask).
Supports 5 combo PHY bases (A-E): 0x162000, 0x6C000, 0x160000,
0x161000, 0x16B000.
- mod.rs: add ComboPhy to IntelDriver (Option, Xe2-only). Initialize
in constructor before power wells when has_combo_phy == true.
Linux reference: intel_combo_phy.c, intel_combo_phy_regs.h
Errors in redox-driver-sys are pre-existing (dma.rs, io.rs),
unrelated to Intel changes.
vasilito
2ee9efd8d0