[Invisalign2] move btm_ble_sec apis signatures to btm_ble_sec.h am: 251409be

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2853883



Change-Id: I68da9c7d1c26628491fce637b9408bdcac674625
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>