website: Update learning-gem5 examples to explicitly set X86

It is now expected in gem5 that ISA targets are explicitly set via CPU
selection. This change makes these changes to the learning-gem5

This change:
updates the scripts within the gem5 repository.

This patch also changes `DerivO3CPU` to `O3CPU`, to keep this

Change-Id: I138153ecdc4732ea6f3ef6c11f91f2974d6cca9e
Reviewed-by: Jason Lowe-Power <>
Maintainer: Jason Lowe-Power <>
Tested-by: Jason Lowe-Power <>
11 files changed