bta_dm: Fix typo for the name of the verification callback.

The original code in bta_dm_sec.cc has a typo with "verifiction".
This commit corrects the name to "verification".

Bug: 378982690
Change-Id: I9b2efdc10454b2febfe40443bdf6379000728bf0
Test: m com.android.btservices
Flag: EXEMPT fix typo