base: Remove duplicate isPow2 helper

This is already defined as isPowerOf2 in src/base/intmath.hh and it
is currently unused

Change-Id: I50b5d344e234fe1d4f1f85186686440773a209e3
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41533
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed