Improved subscription controller logging

The local log of subscription controller
was flooded by getPhoneId messages. Clean
it up so it's easier for debugging in the
future.

Bug: 131703682
Test: Manual
Merged-In: I2c2c867b423c166242f2f7e658427f994af4eb2c
Change-Id: I2c2c867b423c166242f2f7e658427f994af4eb2c
(cherry picked from commit d9a0cfa7)