pre-allocate EC memory by default at startup (#18846)

cmd/server-main.go

@@ -74,12 +74,6 @@ var ServerFlags = []cli.Flag{
 		EnvVar: "MINIO_LISTENERS",
 		Hidden: true,
 	},
-	cli.BoolFlag{
-		Name:   "pre-allocate",
-		Usage:  "Number of 1MiB sized buffers to pre-allocate. Default 2048",
-		EnvVar: "MINIO_PRE_ALLOCATE",
-		Hidden: true,
-	},
 	cli.StringFlag{
 		Name:   "console-address",
 		Usage:  "bind to a specific ADDRESS:PORT for embedded Console UI, ADDRESS can be an IP or hostname",