Staging: rtl8192e: Fix Sparse Warning for Static Declarations in rtllib_softmac.c

This patch fixes the following Sparse warnings in rtllib_softmac.c-

drivers/staging/rtl8192e/rtllib_softmac.c:3636:12: warning: symbol 'rtllib_MgntDisconnectIBSS' was not declared. Should it be static?
drivers/staging/rtl8192e/rtllib_softmac.c:3661:13: warning: symbol 'rtllib_MlmeDisassociateRequest' was not declared. Should it be static?
drivers/staging/rtl8192e/rtllib_softmac.c:3687:13: warning: symbol 'rtllib_MgntDisconnectAP' was not declared. Should it be static?

Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>