Allow systems having a page size greater than 4K to use fewer
scatter-gather XHCI TRB entries for its payload data. The XHCI
controller can handle at least 65536 bytes per scatter-gather list
entry.

MFC after:	1 week
Suggested by:	Kohji Okuno <okuno.kohji@jp.panasonic.com>


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276407 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f