mem-cache: Replace block visitor with std::function

mem-cache: Replace block visitor with std::function

This change modifies forEachBlk tags function to accept std::function
as parameter. It also adds an anyBlk tags function that given a
condition, it iterates through the blocks and returns whether the
condition is met.

Finally, it uses forEachBlk to implement the print, computeStats and
cleanupRefs functions that also work for the FALRU class.

Change-Id: I2f75f4baa1fdd5a1d343a63ecace3eb9458fbf03
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/10621
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>