staging: r8188eu: use ieee80211 to set addba resp capabilities

Use the mgmt structure and defines from ieee80211.h to set the
capabilities field of an addba response.

Tested-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220602193726.280922-5-martin@kaiser.cx


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