Remove icon name from NR dump

While occasionally useful, the call to create the Resources
object can take long enough that threads waiting on
the notificationlist lock (that we hold while dump()-ing) will
ANR and crash system_process.

Test: none
Fixes: 134505821
Change-Id: I8c6246cb1debc2c3d548c300e76d9279e29e2d4f
(cherry picked from commit c4ced654)