Add removeInstanceForPackageMethod to SensorManager

In order to ensure that clients don't leak their sensor manager
instance that we currently store in a static map, they need to be able
to remove their instance. Otherwise, this instance is never removed from
the list and will hang around until our SensorManage instance is
destroyed.

Bug: 269014004
Test: Run ./libsensorserviceaidl_fuzzer
Change-Id: I52185f74ae8d28b379440235ca6f03c5089081f5
(cherry picked from commit 9532f7c6)
Merged-In: I52185f74ae8d28b379440235ca6f03c5089081f5