Query methods for VINTF native instances

isDeclared(name), getDeclaredInstances(interface),
updatableViaApex(name), and getUpdatableNames(apexName) are extended to
support native instances when
- "name" is formatted as e.g. "mapper/minigbm",
- "interface" is formatted as e.g. "mapper"

Bug: 316051788
Test: atest servicemanager_test
Test: atest --host servicemanager_unittest
Change-Id: I0520888dbf5d30c66b97058f45cd6828731ca8bc