usb: Enable hcd support on SH unconditionally.

Previous boards were likely seeing USB_ARCH_HAS_HCD selected by way
of PCMCIA or PCI, though none of those are required for hcd support
on SH. Enable support unconditionally.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>