Invert AHCI_Q_NOBSYRES quirk meaning, waiting for readiness by default.

I gave up to update list of Marvell chips that require this quirk.
The final nail was growing number of PCIe/M.2 SSDs where Marvell chips
have PCI IDs of different vendors.
Fix typo in comments.

Submitted by:	Benedict Reuschling <bcr@FreeBSD.org>
MFC after:	6 days

(cherry picked from commit 1091f6dff6c692ae8f8b224db3057a6c1b3619a8)