Revert "powerpc/T104xRDB: Fix endian access issue on EHCI intinalization"

There was an EHCI endian accessor issue. Now it's fixed by commit
9829ce2f ("usb: ehci: Fix accessors for big-endian platforms and
descriptors"). Revert commit e6a727ff ("powerpc/T104xRDB: Fix
endian access issue on EHCI intinalization"). On T104x platform,
USB EHCI register use little endian.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
[YS: revised commit message]
Reviewed-by: York Sun <york.sun@nxp.com>