Revert "cmd/geth: rename --vmodule to --log.vmodule (ethereum#27071)"

This reverts commit 518de7f.

internal/debug/flags.go

@@ -45,17 +45,10 @@ var (
 		Value:    3,
 		Category: flags.LoggingCategory,
 	}
-	logVmoduleFlag = &cli.StringFlag{
-		Name:     "log.vmodule",
-		Usage:    "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=5,p2p=4)",
-		Value:    "",
-		Category: flags.LoggingCategory,
-	}
 	vmoduleFlag = &cli.StringFlag{
 		Name:     "vmodule",
 		Usage:    "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=5,p2p=4)",
 		Value:    "",
-		Hidden:   true,
 		Category: flags.LoggingCategory,
 	}
 	logjsonFlag = &cli.BoolFlag{
@@ -156,7 +149,6 @@ var (
 // Flags holds all command-line flags required for debugging.
 var Flags = []cli.Flag{
 	verbosityFlag,
-	logVmoduleFlag,
 	vmoduleFlag,
 	backtraceAtFlag,
 	debugFlag,
@@ -260,14 +252,7 @@ func Setup(ctx *cli.Context) error {
 	// logging
 	verbosity := ctx.Int(verbosityFlag.Name)
 	glogger.Verbosity(log.Lvl(verbosity))
-	vmodule := ctx.String(logVmoduleFlag.Name)
-	if vmodule == "" {
-		// Retain backwards compatibility with `--vmodule` flag if `--log.vmodule` not set
-		vmodule = ctx.String(vmoduleFlag.Name)
-		if vmodule != "" {
-			defer log.Warn("The flag '--vmodule' is deprecated, please use '--log.vmodule' instead")
-		}
-	}
+	vmodule := ctx.String(vmoduleFlag.Name)
 	glogger.Vmodule(vmodule)
 
 	debug := ctx.Bool(debugFlag.Name)