tests: Fix ap_acs_5ghz false negative by using common finalizer
ap_acs_5ghz fails with this message:
---------------
wlan0: Country code not reset back to 00: is US
wlan0: Country code cleared back to 00
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hostap commit
91b6eba7732354ed3dfe0aa9715dc4c0746e3336
'Move MAC address randomization enable/disable to helper functions'.
wireless-testing commit
66c112cbd1d44d05322bb4eef908c82a68adbb5e
tag: wt-2019-06-26.
This patch fixes the issue.
Signed-off-by: Masashi Honma <masashi.honma@gmail.com>