libcore: Set CAP_LAST_CAP as CAP_BLOCK_SUSPEND

CAP_LAST_CAP was being set to CAP_ALARM_WAKE which did not allow
system processes to acquire CAP_BLOCK_SUSPEND capability.
This change correctly sets CAP_LAST_CAP to CAP_BLOCK_SUSPEND.

Change-Id: I812edf75eec8f228e2a5d49ae0d3a250e10e0994
Merge "libcore: Set CAP_LAST_CAP as CAP_BLOCK_SUSPEND" into kitkat