staging: rtl8192u: make in ieee80211/rtl819x_BAProc.c some local functions static

Make some local functions (ActivateBAEntry, DeActivateBAEntry,
TxTsDeleteBA ,RxTsDeleteBA and ieee80211_send_DELBA) static and fix
coding style in this function declarations when It is necessary

Fix the following sparse warnings in ieee80211/rtl819x_BAProc.c

drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c:16:6: warning: symbol 'ActivateBAEntry' was not declared. Should it be static?
drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c:28:6: warning: symbol 'DeActivateBAEntry' was not declared. Should it be static?
drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c:40:4: warning: symbol 'TxTsDeleteBA' was not declared. Should it be static?
drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c:70:4: warning: symbol 'RxTsDeleteBA' was not declared. Should it be static?
drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c:310:6: warning: symbol 'ieee80211_send_DELBA' was not declared. Should it be static?

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>