Keystore.java: Make apps tolerant to keystore crashes

Since keystore accepts asynchronous requests it may be that apps wait
forever if keystore dies. This patch adds a death recipient to all
keystore promises so that Keystore.java gets notified when keystore
dies.

Test: atest android.keystore.cts
Bug: 111443219
Bug: 128991260
Change-Id: Ie6e4a4f371287f83a2cdf4069d5686c67d8aebc1