adaasync(): Set ADA_STATE_WCACHE based on ADA_FLAG_CAN_WCACHE
The attached patch lets adaasync() set ADA_STATE_WCACHE based on
ADA_FLAG_CAN_WCACHE instead of ADA_FLAG_CAN_RAHEAD.
This fixes a regression introduced in r300207 which changed
the flag names.
PR: 220948
Submitted by: Fabian Keil <fk@fabiankeil.de>
Obtained from: ElectroBSD
MFC after: 1 week
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head/sys/cam/ata/ata_da.c