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 <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Reviewed-by: Anthony Gutierrez <fe4627c83134668039628e34eb0e4dda45a5da5e@amd.com>
Reviewed-by: Bradford Beckmann <b15a058fc1afc6d0fa0f02c7f237fa09d9ada29e@amd.com>
Maintainer: Anthony Gutierrez <fe4627c83134668039628e34eb0e4dda45a5da5e@amd.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5