Realtek switch SoC docs

longan feature MIRRORING

Registers

Offset Name Summary
MIRRORING
a2a0 MIR_CTRL
a2b0 MIR_SPM_CTRL
a2c0 MIR_DPM_CTRL
a2d0 MIR_SAMPLE_RATE_CTRL
a2d8 MIR_QID_CTRL
a2dc DMY_REG0_MIRROR