mem-cache: show in DPPRINTF if block is prefetched
mem-cache: show in DPPRINTF if block is prefetched

Add the prefetch status in the DPRINTF showing the
state of a cache block.

Change-Id: Ib8edf882dc17414f751cc8773d9035ee2887e971
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47202
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>

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