scons,mem-ruby: export need_partial_func_reads in SConstruct

need_partial_func_reads should now be modified from protocol specific
files (e.g. src/learning_gem5/part3/SConsopts)

Change-Id: I38039aab6178a019d063d6124200050f2ed7b446
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43043
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed