Add 2 missing bus_dmamap_sync() calls. Those fix random 'scan timeout', 'could not set power mode', 'device config failed' and other errors due reading invalid memory.
Add 2 missing bus_dmamap_sync() calls. Those fix random 'scan timeout',
'could not set power mode', 'device config failed' and other errors due
reading invalid memory.

Obtained from:	OpenBSD
MFC after:	3 days

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