mem: Get rid of another unused Request constructor.
mem: Get rid of another unused Request constructor.

This one took an explicit "time" value instead of using curTick().

Change-Id: I935ba1dfc194dcf156d7defedb6ce540db461ce4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26228
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>
Maintainer: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5