libbinder_ndk: expose updatable-via-apex

This new API is to expose the value of updatable-via-apex. In API31,
AServiceManager_isUpdatableViaApex was added. Some HAL clients need to
know the name of APEX for a certain service when it's updatable via
APEX to get more info using the apex name as key. (For example, APEX
version)

Bug: 249190796
Test: libbinder_ndk_unit_test
Test: manually specifying updatable-via-apex on a
    service and checking the result
Change-Id: Ic729c50abce783addd302e8c98c1994422882437