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.

Signed-off-by: Amar Singhal <asinghal@codeaurora.org>
Change-Id: I79aceece8e7f17bbcf8186b03c74d82be82c5a4c
CRs-Fixed: 2201959