mem-cache: Fix bug generated by 8282
mem-cache: Fix bug generated by 8282

Merge 1ae7fced4d32898531a6875a339ef00e43e20e66 generated
a bug in tagsInUse calculation.

Change-Id: I079e327a0a26a7968f2ed8e433dd6e790c80998b
Reviewed-on: https://gem5-review.googlesource.com/8781
Reviewed-by: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>
Maintainer: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>

TUD-OS/gem5-dtu,gem5/gem5,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,gem5/gem5,gem5/gem5,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,gem5/gem5,gem5/gem5,TUD-OS/gem5-dtu,gem5/gem5,TUD-OS/gem5-dtu,gem5/gem5