rtlwifi/rtl8723ae: Replace magic number by macro

For consistency with other drivers, replace a magic number by a macro.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/rtlwifi/rtl8723ae/hw.c
Simple merge

diff --cc drivers/net/wireless/rtlwifi/rtl8723ae/reg.h
Simple merge