Remove allowBlocking from BluetoothManagerService

Since Bluetooth is becoming a mainline module, it can no longer call the
allowBlocking hidden api.
Instead, corresponding aidl are moved to be oneway and use a synchronous
data to handle the return value.
also: aosp/1927380 for similar work on all bluetooth profiles
BluetoothGatt will be done next

Bug: 211851706
Test: build + start bt
Tag: #refactor
Change-Id: I715cc2d8f2ae42be6d1099cd73095d37fa9e30f4
Merged-In: I715cc2d8f2ae42be6d1099cd73095d37fa9e30f4