BTM_SecIsSecurityPending -> BTM_SecIsLeSecurityPending

Also inside this method, check just LE link encryption state.
All callers are LE clients, and care only about LE link state.

find -type f -exec sed -i 's/BTM_SecIsSecurityPending/BTM_SecIsLeSecurityPending/' "{}" +;

Bug: 384067940
Test: manual, pair with LE device
Flag: exempt, small bug fix
Change-Id: I04a7316fff1b089ec29ef22940b5d4e91d6ddccc