staging: r8188eu: remove UsbTxAggMode from struct hal_data_8188e

UsbTxAggMode in struct hal_data_r8188e is only used in a single if
statement. Remove UsbTxAggMode from the hal_data_8188e structure and
adjust the if statement.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220201084259.7497-7-straube.linux@gmail.com


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