configs: Change env defaults in apu_se.py for ROCm

configs: Change env defaults in apu_se.py for ROCm

This change simplifies the setup process for running
ROCm-based programs by adding the libraries that are
needed to LD_LIBRARY_PATH by default, using
preexisting environment variables that should be set
on the host.

HOME also gets set, as MIOpen-based programs can fail
without it set.

Change-Id: Ic599674babeaebb52de8a55981d04454cdc96cd8
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/30275
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Bradford Beckmann <brad.beckmann@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>