Register ProtoLog groups on ShellInit instance creation

We use ProtoLog before the ShellInit#init() method is called for example when registering callback for when ShellInit#init() is triggered. So we are moving the group registration earlier.

Test: Build and make sure SysUI doesn't crash.
Flag: EXEMPT bug fix
Change-Id: Idf4d01e67d15c0caa688e2b480ba338ac8c270e1