ramips: rt3833: fix build breakage

ramips: rt3833: fix build breakage

Commit 60f41c6c9ef6 ("ramips: add usb-ledtrig-usbport to DEVICE_PACKAGES
of CY-SWR1100") added stray | during backport which caused build
breakage on the buildbots:

 bash: -c: line 0: syntax error near unexpected token `|'
 bash: -c: line 0: `echo kmod-usb-core kmod-usb-ledtrig-usbport kmod-usb-ohci kmod-usb2 swconfig | | mkhash md5 | head -c 8'

Fixes: 60f41c6c9ef6 ("ramips: add usb-ledtrig-usbport to DEVICE_PACKAGES of CY-SWR1100")
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit a1ff175dbf807925a0bae537935455bd1aa44a98)