Use HexDump instead of java.lang.IntegralToString

java.lang.IntegralToString is being removed, replaced
all its usage by com.android.internal.util.HexDump.

Bug: 24932279
(cherry-picked from 15fc0548a536750110e159e06a39ba943eccdd81)

Change-Id: Id6ab88337af12d93cd73c41775b9d5baa1e61d96
6 files changed