Attribute wakelocks held by RIL to clients

Telephony services are requested by applications and other
services in the Android framework. Attribute the wakelock
held time to the applications and services that requested
the particular operation.

If multiple clients are requesting for a service at the same
time, divide the time equally between all the requests

Test: Through logs confirmed that the wakelock decrement is happening
    correctly
BUG=31041780
Merged-In: Id5521809d5a4324c1bd9dc229a743033886b35a3
Change-Id: Id5521809d5a4324c1bd9dc229a743033886b35a3