staging: rtl8188eu: remove write-only HwRxPageSize

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

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210725155902.32433-13-martin@kaiser.cx


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