staging: rtl8723bs: Remove redundant MAC_ARG macro

staging: rtl8723bs: Remove redundant MAC_ARG macro

The MAC_ARG(x) macro is a useless identity macro that just returns its
argument unchanged. It was used alongside the %pM format specifier for
printing MAC addresses, but %pM already handles MAC address formatting
directly without needing any wrapper macro.

This commit removes the macro definition from both:

include/osdep_service.h
include/ieee80211.h

And removes all 6 usages throughout the driver

Signed-off-by: Yuvraj Singh Chauhan <ysinghcin@gmail.com>
Link: https://patch.msgid.link/20251226013035.206284-1-ysinghcin@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>