Update apex_available field

'ipmemorystore-aidl-interfaces-java' is in the allowlist for 'com.android.tethering'
So, instead of using the allowlist, updated apex_available field of the interface.
Accordingly, cleaned up the allowlist(aosp/1396192)

Bug: 146436251
Test: m nothing
Change-Id: I12b1f5c9daa56e1bc77bb2f48980b2e51a714764