staging: rtl8723bs: Remove duplicate #defines.

The modified file includes 'linux/ieee80211.h', but redefines many
constants that already exist in the header.  This will create a conflict
if the values are ever changed in the kernel.

Signed-off-by: Quytelda Kahja <quytelda@tamalin.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>