Remove unused hwmode wifi option #1595

Job	Run time
check	21s
test	8m 6s
rustfmt	9s
audit	18s
clippy	40s
cross-aarch64	40s
integration-test-five-nodes	13m 18s
cross-armv7	36s
integration-test-multi-exit	13m 30s
integration-test-eth-payments	13m 53s
integration-test-althea-payment	16m 49s
integration-test-debts	16m 39s
integration-test-db-migration	12m 22s
integration-test-validate-contract	12m 8s
	1h 49m 29s

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