Update arguments to vold binder to use byte[] secret for CE storage

We have replaced the current `string secret` argument to the lock/unlock of
CE storage with a `byte[]`. This is part of an effort to remove instances
of the LSKF and LSKF-derived secrets that are available in a RAMdump.

This CL is the propagation of this argument change to the binder invocation
in the StorageManagerService.

Bug: 320392352
Test: see Icd4c925f2fd79e7533fdf9027e16f6736dbe1ab3
Change-Id: Ibef6da208302c6a0b47f33f947f8bf8ea55eaa35