Add logging around export of IRemotelyProvisionedKeyPool

If we cannot create an IRemotelyProvisionedKeyPool binder, keystore
starts up as normal. However, we were not logging _why_ the operation
failed. This change adds a bit of logging so that we can diagnose when
devices are missing the IRemotelyProvisionedKeyPool service.

Test: keystore2_test
Change-Id: I60a481dc9762d8b156c5bec9e622a7e2192d145d
1 file changed