driver: use the built-in min/max function

Starting from Go 1.21, the min/max functions are built-in.

Therefore, we can remove the custom functions with the same name.

Change-Id: Ie3490436ce36e8548a834628d7a269bf58afbd01
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/707475
Reviewed-by: Sean Liao <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Sean Liao <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>

Author: cuishuang

driver/driver.go

@@ -374,20 +374,6 @@ func roundUp(n uint64) uint64 {
 	}
 }
 
-func min(a, b uint64) uint64 {
-	if a < b {
-		return a
-	}
-	return b
-}
-
-func max(a, b uint64) uint64 {
-	if a > b {
-		return a
-	}
-	return b
-}
-
 var tmpSeq = 0
 
 func tempFilename(ext string) string {