Revert "usb: JZ4750D: Add usb host for JZSOC"

This reverts commit b8c751c84c9a54dfeec60fff88a01ba38521141e.

JZ4750D doesn't have USB host (ohci)
Revert "Patch usb core for JZSOC"

This reverts commit 76bfd8d74fe44f1d292c34bd2394f762f671cadc.

JZ4750D doesn't have USB host (ohci).
MIPS: JZ4750D: Remove ohci device definitions, there's no USB host anyway