staging: rtl8723bs: remove MSG_8192C macro definitions

remove obsolete MSG_8192C macro definitions.

MSG_8192C is a private trace mechanism macro and is deactivated.
(i.e. the default behaviour is _do nothing_)
The only way to activate it is to manually define a debug
symbol.

So just remove it.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/97f38f269e8dabb3dd7464d49022a62cd9773657.1617971593.git.fabioaiuto83@gmail.com


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