With MACRO FEATURE_WLAN_CH_AVOID_EXT enabled,
"restriction_mask" can only be checked if
coex_unsafe_chan_nb_user_prefer = 1. If the INI
coex_unsafe_chan_nb_user_prefer = 0, do not need to check
"restriction_mask". It will remain uninitialized 0.
Change-Id: If7bd1223ee3779b72fadb40e622f682db03f4ea5
CRs-Fixed: 3287634