staging: r8188eu: remove ODM_Read4Byte

Remove the ODM_Read4Byte wrapper and call rtw_read32 directly.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211102081833.18054-3-martin@kaiser.cx


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