MFC r214349:

MFC r214349:
The EHCI_CAPLENGTH and EHCI_HCIVERSION registers are actually sub-registers
within the first 4 bytes of the EHCI memory space. For controllers that
use big-endian MMIO, reading them with 1- and 2-byte reads would then
return the wrong values. Instead, read the combined register with a
4-byte read and mask out the interesting quantities.

Requested by:	marius

git-svn-id: svn://svn.freebsd.org/base/stable/8@214745 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f