staging: rtl8723bs: Remove #defines shadowing enums in 'linux/ieee80211.h'

The modified file includes 'linux/ieee80211.h', but #define's many
constants that shadow enum members in the header.  This will create a
conflict if the values are ever changed in the kernel.  Remove these

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