configs: Remove remnants of /dev/shm mapping from apu_se
configs: Remove remnants of /dev/shm mapping from apu_se

This patch removes a redirect for /dev/shm. It also removes
a function call that cleaned up the /dev/shm redirect

Change-Id: Iec2598c715223d079bc5dfd2ea52859945706cfc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/32354
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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