defconfig: Enable cellular hints in regulatory cfg80211

The user-space may send regulatory hint that has cellular sub-type
enabled. To process such events, enable
CONFIG_CFG80211_REG_CELLULAR_HINTS.

Change-Id: I3e43ea7f7f3c18e0231df32abe2c174342a75d12
CRs-Fixed: 2597698
Signed-off-by: Ashish Kumar Dhanotiya <adhanoti@codeaurora.org>