staging: r8188eu: IntArray and C2hArray are set but never used

staging: r8188eu: IntArray and C2hArray are set but never used

The fields IntArray and C2hArray of struct hal_data_8188e are set but
never used. Remove them and remove interrupt_handler_8188eu() since it
does nothing now.

While at it, remove the unsed defines USB_INTR_CONTENT_CPWM1_OFFSET
and USB_INTR_CONTENT_CPWM2_OFFSET as well.

Acked-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220101084937.3411-7-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>