staging: r8188eu: remove write-only HwRxPageSize

HwRxPageSize from struct hal_data_8188e is set but never read. Remove
the component and the code to initialise it.

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211005200821.19783-3-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>