sim: Use memPools in SE mode only
sim: Use memPools in SE mode only

memPools have been added by:

https://gem5-review.googlesource.com/c/public/gem5/+/42215

and are supposed to be used in SE mode only.
Current code is assuming there is at least one memory which is visible
to the OS/bootloader (conf_table_reported = True). This makes sense
in SE mode as it emulates the OS, but it shouldn't be enforced
in FS baremetal simulations

With this patch we are making sure memPools are used in SE mode
only.

Change-Id: Icebb7dafc18a6fdad0f9b16e5a988270bbebb9eb
Signed-off-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44845
Reviewed-by: Matthew Poremba <f1eb50f3368ce197c52b19f7fdb5aa7a278f15fd@amd.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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