[automerger skipped] Merge "Import wifi_channel_stat into legacy_hal namespace." am: 9883e2fc46 am: 273d2dd6e7 am: c23b2b2066 -s ours

am skip reason: skipped by user pcc

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1559106

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2dfbd4264f4e019785056ae396971adab44bd037