Fix a11y service targeting sdk version doesn't update

The accessibility service connection uses old service info
to create connection while the system is trying to rebind the
enabled services after packages finished updated. The root
cause is we always reloaded the installed service info after
the a11y services were rebound. To fix this issue, always
reloads the installed service info before rebinds the services.

Bug: 152817355
Test: All a11y related cts tests
Change-Id: Iab424940fc47b5a5f44096d67dc7bdfe2d43c5be