Check AServiceManager_isDeclared before AServiceManager_getService

Call AServiceManager_isDeclared before calling AServiceManager_getService
to avoid the waiting time when aidl service is not available.

Bug: 286969060
Test: run VtsHalGatekeeperTarget
(cherry picked from https://android-review.googlesource.com/q/commit:32e1c70f275991ec7fe4d4a2d6e3eeba2a172540)
Merged-In: I7d652a546cb810a601338a68950f01d065aea7a5
Change-Id: I7d652a546cb810a601338a68950f01d065aea7a5