staging: r8188eu: clarify the contents of the delba params

staging: r8188eu: clarify the contents of the delba params

The delba parameters field contains an initiator/receiver flag and the
tid. The caller of issue_action_BA passes these components in the status
parameter.

Extract the two components from status and use u16_encode_bits to copy
them into the parameters field. This should clarify what's going on and
should make it easier to replace the status parameter in the future.

Tested-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220602193726.280922-9-martin@kaiser.cx
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>