misc: Delete the now unnecessary create methods.

Most create() methods are no longer necessary. This change deletes them,
and occasionally moves some code from them into the constructors they
call.

Change-Id: Icbab29ba280144b892f9b12fac9e29a0839477e5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/36536
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/cache/cache.cc

@@ -67,6 +67,8 @@ Cache::Cache(const CacheParams &p)
     : BaseCache(p, p.system->cacheLineSize()),
       doFastWrites(true)
 {
+    assert(p.tags);
+    assert(p.replacement_policy);
 }
 
 void
@@ -1429,12 +1431,3 @@ Cache::sendMSHRQueuePacket(MSHR* mshr)
 
     return BaseCache::sendMSHRQueuePacket(mshr);
 }
-
-Cache*
-CacheParams::create() const
-{
-    assert(tags);
-    assert(replacement_policy);
-
-    return new Cache(*this);
-}