mem: format address in hex in the memory controller debug trace

Before it was using the decimal format contrary to
everywhere else in gem5.
This was making it difficult to follow an address in the trace
once going to main memory.

Change-Id: Ia0e7d1624b593d8a21d5b3563893e2c0bcc8ed1c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47043
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed