scons: Update 'ALL' compilation to use MESI_Two_Level

The MI_Example coherence protocol is a poor default.

Change-Id: I2baec29ef18a9cb9f0d5751155935cae4621af5d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63372
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
1 file changed